They know that already.
They all have iPads or smartphones. By comparison a Raspberry Pi is a toy. P.S. you think they care that they can use a machine, if it can't play GTA V and Overwatch?
I work in IT in schools, always have. RPi are a waste of time. MicroBits are even worse. Pretty much everything they want to do, they know they can do on an iPad, Android phone, or portable PC. They already don't care about OS or architecture.
What they do know, though, is that you need a decent PC if you want to do anything serious, especially 3D or video editing, and everything else is so damn powerful that a RPi 3 is just a joke. They might like plugging it in, that's about it. It's not a wonder-toy to a kid that has even the most basic Samsung Galaxy (which will be smaller, faster, have integrated 3D, run on Android, and probably is in their pocket). And yet, you still need monitors to plug into, power supplies, kits of parts, keyboards, etc. And a space to do it in. Gosh, if only every school had, like, a suite in which they had all that kit and workspace already? You have to shove the PC out of the way to play with the RPi or add in so many other parts you could buy them all an iPad / Chromebook each anyway.
Guess what app they all try to install on their iPads? Word. We don't even give them Office 365 but they all expect to open things in Word by default even on non-MS platforms. They are completely platform-agnostic, but they "know" they need Word.
So, sorry, but the RPi's aren't all that interesting. And staff don't know how to utilise them. And apart from a little computing lesson where you learn to plug it all in, everything they do is better off done on a real computer.
If you go to BETT, they were pushing MicroBits one year. Literally no products - just pushing what they could do but you couldn't buy them. And a few years before it was RPi. No lesson plans, no teacher assistance, just boxes of gadgets. Both are now almost invisible, like the 3D printers before them, visualisers before that, etc.
This stuff isn't for education, which has entirely different priorities to you and I (and I work in private education with kids who go to Eton... they literally lose all interest in RPi etc. within minutes but will happily build their own drone aircraft). Coding? Yeah, they "did that". Whether it was Scratch or Python it consisted precisely zip of their lessons over even their primary education and then that was done. Why? Teachers who can't code and who have huge curricula which includes a lot more than coding. Or playing about with little gadgets.
To be honest, you could run a school without visible Windows. I have seen one or two attempt it, reverted one (reluctantly being a massive Linux fan, open-source programmer, etc. myself but they really messed it up), and I tell you that you could run the kid-side easily on anything you liked. Google GSuite for Education, a handful of third-party website subscriptions, any decent browser and that's 99% of what you need for the kids to get through all they ever need to - including testing and assessment. Guess how many go that route? Very, very, very few. Why? Teachers ask for Windows and Office. Why? 10 years ago, those teachers were the same kids with the teacher who was baffled by Windows 7 and who would have stayed on XP forever. Trace it back enough and you still see things like "Word is the word-processor, Excel is the spreadsheet" as if nothing else exists.
Sorry, but education is a market based on teaching things that you're told to teach, when you were never taught them yourself, so they stick exactly to what they know and can pick up quickly themselves. Just try explaining app vs website to most teachers and you could be there for hours. Especially when you then demonstrate that "the iPad app we must have" won't run on Android / Chromebook / Windows.
Education doesn't care about your RPi's precisely because - as I warned at the time - RPi doesn't care about the teachers. Look around and only OTHER TEACHERS provide resources to use for them linked with the UK national curriculum in any way. And that curriculum changed smack-bang as RPi came out. Teacher won't touch that without paying £1000 for the "pack" of RPi's with massive book of lesson plans and a 3 hour course for their entire staff with a support line the other end. That, pretty much, doesn't exist.
Until then, every school you see will be paying for Microsoft licensing annually (but we pay for one copy of Windows/Office per full time teaching employee only anyway), still buying iPads AND Chromebooks AND PCs AND other stuff, and then still complaining Word can't run on a RPi. And your kid will come out thinking half-a-dozen copy-pasted lines of Python is "programming".
P.S. I was also an early tester for RPi 1.0... including diagnosing the Ethernet/SD card USB bus saturation issues with Broadcom directly. My RPi is gathering dust in the attic, as are the school ones at every school I've worked at since they came out.