So was trying this method of swapping your Target Skeleton in a child AnimBP in UE5, however my character exploded. Speaking with UDN, I was given this response.
“The intended solution for this in UE5 would be the template anim blueprints that we added. They’re skeleton agnostic so allow you to setup your graph and then derive from it as a child blueprint at which point you can specify the skeleton you want to use.”