MLB umps in minors during '94-'95 strike?

[Brent G.]

I won this Michael Jordan signed baseball at auction, which was owned by former MLB ump Ken Kaiser prior to his death in 2017. It came with his hat (signed by him inside) and business card as part of the provenance.

I'd like to figure out when it was most likely that Kaiser called an MJ game -- whether at the end of the '94 Birmingham Barons season, '94 Arizona Fall League, or spring training in '95.

I'd appreciate any insight into how the umps might've filtered down to the minors -- if that happened at all -- once the gates closed in August '94. Thank you!