I tend to get very achey feet and ankles, can anyone recommend good workouts or class styles for me? (except for swimming, I can’t swim to save my life)

Achilles stretches , golf roll ball sand walking , Mable pick up could help with the achy feet . It is simple and does not use too much of your energy .

There are a lot of core workouts where you kind of lie on your back!
Yoga also has a lot of options that won’t put too much pressure on your feet.
You may also want to check if it’s your shoes causing the ache, my husband used to sell shoes for a living and he’s said that’s often the case.

I say sports wise track and if you have weak ankles maybe try just doing regular sit ups push ups to keep all those things going