Metahuman amputations & attached prosthesis

Hi everyone.
I’m still a novice in the use of Metahumans so please excuse my lack of knowledge.

I am trying to create a scene of a Metahuman with an amputated lower arm. Any ideas on how to create a metahuman with a stump? I can obstruct the stump, if necessary, as the prosthesis is going to animate onto the Metahuman.
After that though the prosthesis should be part of the Metahuman, so that I can use animations on the Metahuman with the attached prosthesis.

Any ideas on how to accomplish this?

Best regards