I broke my ankle a few years back – the surgeon told me that once the plaster comes off you have another 6-8 weeks before the bone is completely mended so take it easy! Just repeat what others have said wobble boards are good, stretching and for me the gym (ughh!) worked.
In terms of pedals as I slowly got back to biking I found that SPD’s made me think about my ankle in a good way – in that I was having to think about what was coming up rather than randomly unclipping to put down a foot in loose corners etc. So I felt at the time I’d be less likely to acquire a new injury.
Good luck and sorry about this bit – take your time