The wheel chair is a bit of weird in the setting. GRRM was more creative and in a more massively magic world it should be easy to think of a more fitting solution.
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Let's just pretend that Zatoichi wasn't a thing. NB he might be fiction but the blind swordsman kicked serious ass.
This would be cool to see! Lots of ways to represent historically unrepresented people in alternative settings.
But... That depends on the magic, doesn't it? I'd argue you could easily use magic to fix disabilities. Or do healers not exist in your world?
The exist, they're not everywhere though. And are typically very cagey about teaching others.
And often times their prices for using their services is pretty bad for the typical person.
One of the PCs though (who joined after the other guy left) is an artificer who was born without legs (currently has prosthetics they made) and the reason he's out adventuring is to bring legs to those who lack them. Like his mentor did for him.
The next town they're getting too will have an NPC without a leg and the artificer should have the components to make a magical prosthetic for them if they want to.
I really got to thinking about this just the other day when I found that a Prosthetic Limb is a common magic item in D&D 5e. (Of course how common a common item is exactly is at DM's discretion, but nevertheless.)
One of the PCs though (who joined after the other guy left) is an artificer who was born without legs (currently has prosthetics they made) and the reason he's out adventuring is to bring legs to those who lack them. Like his mentor did for him.
That's my kind of power fantasy right there.
If you manage to get through a campaign of WFRP without anyone losing an eye you’re doing it wrong ;)