I skied as a kid, but did my knee (hill walking – don’t do it, it’s a dangerous extreme sport) in my twenties.
A board is fine, but as well as the ankles (which I don’t have any problem with) it does strain the hips a little.
Note also, my wife who has done her ankle a few times, has no problem with a board, so it may be the particular ankle injury.
If you can find a Swiss trained coach that might help. The French types all talked to me about pedalling the board, whereas the Swiss were into body position.
Both have their place but with an ankle injury body position is going to be an easier place to start.
Also – worth a trip to one of the fridges to see if it works before you go?
Edit: my earlier post was sent sober, but doesn’t read like it. I’m now back in gone hotel, but I think I’m getting away with sounding far better than earlier – no?