My ankles aren't happy. It's like I can feel every booboo I've ever had. This kata and I are going to become good friends and I'm going to learn how to use my legs better.
My last PT showed me how to modify my gait and it may be applicable here. Because I have Pes Planus (flat feet), my feet pronate (turn inward). That puts valgus (inward) stress on my knees. As long as I turn my feet out a little bit more when I walk it widens my gait and reduces that valgus stress.
The footwork in Shisochin kata is 99% zenkutsu dachi, a long stance which puts a great deal of stress on the ankles. I couldn't do a single stance without my metatarsals separating, so I'm going to have to modify it.
Here's the thing about modifying moves: Mark Twain advised that we learn the rules, then break them. Zenkutsu dachi is one of the stances I struggle to master because it's big and it's painful. However, it's going to take getting this stance right to learn what I truly can do, so that I only adapt what I truly cannot do safely.
More research will be necessary! It's exciting! Still, at this point in the discovery process it's pretty painful, it would be nice if I could sleep. :)