alordcharlie, we decided to go ahead with this and I have 95% of the school (including SLT) converted to chromebooks (with the other 5% moving over after hectic September - all admin staff) and plan on switching off our windows server in the October half term. We were also using smart notebook and have moved to using Smart Lumio instead. It opens the majority of Smart notebooks with just a few with embedded videos/audio in the wrong format causing an issue.
It took over 18 months of planning and relentlessly talking up the benefits to the staff to get Governor/headmaster approval but the case for the change was overwhelming.
In reality the changeover has been considerably smoother than I had anticipated and the buy in from the teachers was significantly enhanced when we purchased and provided them with touchscreen, 15" chromebooks (Lenovo flex 3 - £249 ex VAT at the time!). They love the almost instant on nature of them and the touchscreen was a huge factor in convincing them we were going in the right direction. We now have 35 teachers teaching with them.
I mapped alternatives to all our software used in the school and found alternatives that were better/cheaper than what we had been using.
Printix was ok but not particularly well featured for the MFPs and after testing with Printix we have replaced our onsite PapercutMF server with Directprint.io instead (brilliant print server by comparison!).
Administration of the chromebooks is so much easier for a non-techy person through the Google Admin panel and in a small school environment this should not be underestimated in terms of cutting external support costs.
We have a small Windows 11 PC (under £250) on the network to run our Paxton software and as a bridge for converting e.g. Publisher files.
With proper planning, converting to Chrome is definitely a good decision. If you want buy in then find a couple of receptive teachers, put them on Chrome and let the speed of the laptops compared to Windows laptops drive a bit of envy amongst the other teachers. I purchased 2 of the 15" inch touchscreen chromebooks and gave them to 2 of the more receptive teachers and within a week I was being asked by other teachers when they could have one too!
As a school our upfront savings on not having to buy Windows PCs and a new server (ours was end of life) was over £30K in the current year with ongoing annual savings of over £8000.
Good luck and if I can help in any way with advice then please don't hesitate to pop another message on here.