ChrisK – you’re quite right, VW is one of the few manufacturers that does produce the odd ‘mid quarter’ revision to their price list. They did this mid Q4 last year when they added the 2.0TSi Tiguan to the price list although in reality it didn’t join the Motability scheme until we’ll into 2021 (Q2 from memory), which further illustrates how ‘all over the place’ this is! Perhaps others are revising price lists more now, given the plunging numbers of cars on the scheme, I haven’t checked tbh.
As for your last point, the last remaining car on Motability is sure to be an EV and as they only come in autos I fear that choice may be even less than you suggest ?