GPV. progress and possibilites

Well, good news, the GPV vendor says 'whoops' and of course they'll accept a return. I'm not sure they appreciate yet that they're picking up the cost of the return, but we'll see.

They claim the other GPV they're selling is genuinely 16", and am I interested? Now I reckon the GPV was close to being what I'm looking for as a short term main chair, long term spare, the only issues were not fitting in it (bit of a killer that) and needing to tune the tippiness. So I'm potentially interested (and it does seem to be in slightly better nick than the current one). I need to check a few things - I want a picture with a ruler against it for one! But unlike the 14" it's a folding high back and forward folding, rather than backward folding as on the clown chair. Because I have issues with the width of a standard back throwing my shoulders out I've mostly been using the clown chair with the back folded (also keeps handles away from overly helpful strangers), but clearly that's not workable with a back that folds forward onto the seat. Long term aim is to get a chair with a good Jay back (which costs more than I paid for this chair) which is narrrow enough not to interfere, plus properly supportive (I've tried  Kaberett's so I know this for sure), but this promotes that from long term aspirational to short term need to look into it now.

So I've got a question. How much effort is it to replace a wheelchair back with a rigid one (I'm going to go see if I can hunt up a GPV manual online in a minute). And are there any decent rigid backs on the market for less than the £450+ a Jay back will cost me? (Because sticking a £450 or £550 back on a £200 chair doesn't strike me as necessarily entirely sensible).