I think this model works for the 13 and 16, because you're already buying a good laptop that you can keep longer by upgrading. The 12's base specs and more than that the experience is pretty bad. The screen and speakers are terrible.
The 13 also targets people buying it for themselves and who value ownership. The 12 targets the education market and how many 14 year olds are sensitive to ownership, repairability and e-waste? If they are they would probably get something better second hand. You'd have to have a parent that is sensitive to this issue and is also willing to force down this bad laptop onto their children instead of whatever they prefer.
I love Framework, and the bet to try to win over the education market was worth making but the execution is so poor that I don't think it works out.
The MacBook Neo will happily last you the 4 years of highschool and maybe your bachelor.