I don't think this will work, from what I've read in previous discussions of this question, but I think there are lots of other things we could explore.
After this pandemic we'll have much more national curriculum material available in online formats and maybe there could be more imaginative ways to make use of that than just aiming it at students of particular ages.
The 2019/20 year 11 and 13s are being given the chance to 'resit' the summer exams they missed this autumn. Could we make similar plans for other years? Could young people up to the age of 22 be given easy ways to register to sit (and get at least a small amount of online support with) GCSE and A level exams right up to the age of, say, 22?
Students can already do this to some extent via resits of core subjects at college or as private candidates, but it isn't routine and easy and doesn't make use of online national curriculum material. We'll have a lot more of that now.
Most of the pandemic generation of school leavers might not need, or want, to do anything like that at all, but for a few who've been particularly badly affected at some stage or other of the pandemic, the chance to easily resit, or sit an extra, GCSE or two, not long after leaving school, could make a big difference, and it could make good use of everything new we'll have learnt by then about distance learning for secondary education.