Jimmy McGuigan definitely played against the Millers, but I don't think he scored a goal. Didn't consider Tom Johnston.
The ones I thought were more likely were Cusack, McEwan, Docherty, Porterfield and Moore. Docherty definitely played against us (Arsenal, FA Cup), think McAnearney, Cusack and McEwan did too - can't find any goals scored though. Not sure that Ronnie ever played against the Millers, same for Porterfield.
The only one that I have confirmed so far is GEORGE KERR, for Bury at Millmoor, Division Two , 25th March 1966. We won 2-1. I was at the game, but can't remember much about it.