The mod I thought out for more posable feet works in theory but when put into practice does not give you that much more movement over standard feet. I could give it more movement by sanding down the width of the feet parts a few mm more than I did but this was something I didnt realise untill Id painted them. When I do a super posable Gerwalk this will be adressed.
I think you could adapt my idea to allow you to use it on a transformable 1/55 with a little bit of refabrication in the hidden area inside the leg, akin to what Fulcy and Kid Kurupt did a while ago.