Wrist joints help?

Posted in Custom Workstation

Well as we all know The Avengers figures have no wrist joints. There are a few other joints they don't have but I think the wrist is the most important since you can get better poses with them holding their weapons.

So is there a way to make wrist joints? Like somehow cut off the hands and stick them back on with a peg?
A way to fix broken wrist joints on figures that have them could likely be used here.

Thanks!!