I dunno if you did any other research into Walter Barron, but Hooligan Championship Wrestling mentions in a 2024 post that a Walter Barron did "all the audio" and a Walter Barron also was owner of a promotion (Velocity Impact Pro Wrestling) and both of those promotions, HCW and VIPW are based in Evansville, Indiana. Safe to say he was a Manager or Authority Figure or what have you in those two IWA-U matches he had.
I know it's against your original rules (iirc), but you could make an exception for it being a Boxing match between a non-Wrestler and the Champion here...maybe?