John, your article was really interesting as I get hot everywhere! Your follow up on the forum reminded me I should do something about it and I ordered the "Air-Flow Seat Cover Split Seat Set LC for R1250GS 2022", thinking I would take advantage of their apparently flexible return policy if needed.
I only use the front seat of my split seat (there is a Pelican toolbox fitted in lieu of the rear set) and the Air-Flow was a perfect fit. I had to make sure the front holes and back tabs were left free for locking by pushing the Air-Flow edges around a bit but the appearance is perfect and, more importantly, there is a pleasant air flow (indeed) when riding around!
I paid $71.95 with a %10 discount (FLOW10) and in my opinion it is well worth it... I just need to make sure I take it out for December rides!