What's the intended purpose? Leader/teacher demonstrating or kids "hands on"?
I ask because if the kids are involved then a robust keyboard is a must, especially if it's one that can be washed to rid it of snot & vomit... No. 1 son has a laptop and frankly the keyboard on it gets minging...
Also consider the advice to most users of laptops is to have a separate keyboard and mouse if it's getting used for any length of time... so you may be better served with a "non-robust" laptop and a rotation of 3/4 wireless desktop (aka keyboard & mouse) sets. If a £40 wireless keybd dies, people will grumble, but £40 later you're fixed, if the keybd on the lappy dies because it's full of snot you're looking at £silly even before someone has the iron gonads to take it apart and replace the keybd...
PS. My 'nads are titanium - I take them apart with the technician they insist on sending with the part present looking over my shoulder :lol: