I'm looking for a large 2x chainring setup for 4:20-4:30 IMAZ bike split. I want to go 2x since it seems the speeds out (up) and back (down) on the course can vary wildly with wind direction on race day. One unanimous piece of advice I've heard is to run a 56 or 58.

Aerocoach sets are sold out. Pyramid sells the large ring, so where can I find a 44t inner chainring? I can run Shimano 4-bolt or 130BCD.
What other options are there?