I have ****ed up ankles from multiple previous injuries and I often have a hard time unclipping my left foot in the normal manner without pain. I have, however, discovered, that I can unclip by rotating my heel in toward the bike, rather than outward like one normally does. Not sure how many systems would operate similarly, or if it would help you at all, but FWIW I ride Time ATAC Alium pedals.

Also, you might look into pedals with adjustable release tension and setting it lower so it's easier to get out when you need to.