Changing the model is what put the MG5 off my radar when I was seriously considering going EV to avail of the last round of grant aid. As I said at the time the big plus is Watty's experience - which I reckon is shared by the vast majority of MG5 owners - i.e. a pretty much trouble free yoke that'll do the job for relatively small money (small money after grant aid compared to a 5/6yo diesel car).
As per this thread there's plenty of MG5s in scrapyards so I doubt there'd be any great difficulty sourcing parts unless you're committed to getting a job done under warranty. I doubt there's as many scrap MGS5s about as they're new so that is a minus in my mind as is the smaller boot size and the fact that MG restrict the battery warranty to 3 years for taxis as opposed to 7 years for private cars. Still, they're c.€8,000 cheaper than an ID4 or BZ4X so you'd still have to quantify and weigh up the value of an extended battery warranty and perceived relative confidence in a locally established brand, I guess. It's all new tech so certainly not as straightforward as concluding that Toyota make the best Hybrids and VAG make the best diesels.