This isn't directly helpful, but when 30-day passes were a thing, did they actually include partner lounges? My memory was that partner lounges were a membership-specific benefit, and that passes didn't unlock those.
30-day passes gave you full membership and access to any lounge regular members could access. Back in my Silver days I would purchase a 30-day pass and access AF lounges at CDG, the lounge agents could not differentiate between a regular membership and a 30-day one.