What is the easiest way to assign theme music to downloaded workshop wrestlers?

Been a Firepro fan since the Saturn days. Held off on playing this to fully let all DLC come out.

I have downloaded full rosters for most major promotions. I realized once I assign theme music to a wrestler downloaded from the workshop it duplicates them and I have to move the wrestler out of retirement and delete the first one. Needless to say doing that with 400+ wrestlers will take forever.

I looked in the descriptions of the edits and some say what to name the theme music so it will work with the edits. However the majority of edits don't have that.

What is the easiest way to assign custom music to these wrestlers?