It isn't clear what gearing ratio that you wish to achieve.
If I understand correctly, your standard setup is a 50-34 crank with an 11-32 cassette but when you tour, you change the crank to a 32 small ring. If so, personally, I could not touch the FD with only a 2 tooth drop in the inner ring. The Shimano RD is rated to 34 teeth. You would achieve the same low gear replacing the 11-32 with an 11-34 and keeping your compact crank than you currently achieve with swapping the front small chainring from 34 with a 32.
There are derailleurs and hacks (hanger extenders) that would make a 40T work but it will affect the shifting performance from the 11T to maybe 15T, but you aren't jumping out of corners in Crits, so, it might not matter much. The GS "might" handle a 36T with a b screw tweak, I dunno. I run 32t on SRAM etap that is designed for 28T and 36T on AXS that is designed for 32T and 39T on one designed for 36T. There is risk. The mechanics should know more.....