So I've been working on a character with a set of animations but at some point in a past save file the IK disconnected from the bones from a couple of the animations and I hadn't noticed and I've done a considerable amount of work since then. I figured the easiest way to fix things would be to import the skeleton from an old animation that does work and drag the specific files/anim states over. This works great except it disconnects the IK handles on the way leaving me in the same spot I was in initially. I tried an old skeleton merging tool I found but it seems to be too out of date to work.
Is it possible to somehow make sure the IK constraints remain intact while moving the bones?