mesh and even vice versa if Possible. I am experimenting with IK hand rigs and retarget
But the results are not good. So If anyone has any ideas or can tell me what my options are please let me know
Explain why results are not good.
IK Retargeting is probably the best option, so it might be that you need to tweak some things in order to make it work.
Assuming that the bone names are the same between the character and hand mesh, alternatively you could
Export all your hand poses you have with the full body
Bulk import them into Maya or whatever is your DCC
Create a script that removes all the joints except your hand bones, and possibly zero out the wrist joint.
Export the animations and import them into Unreal
On import choose your hand skeleton as the base skeleton