I've been running XT 2x cranks on the gradventourer for years now. Until recently, I'd been using a Claris front mech with an offset shim to let it reach the MTB chainline. Have just fitted a GRX400 front mech with braze on adapter, and it reaches the outer chainring no problem without any mods.
It won’t be the end of the world if we can’t find 165mm cranks but it would be nice. I’ve heard from friends that availability in Colombia is good, I just hope it’s not all 12 speed one by.
A couple of caveats: 1) it's a non-boost chainset, and 2) the rear end of the front mech doesn't have much clearance for the chainstay. This latter factor is with 40/28 rings, and it could go a little lower, but might be something to consider/experiment with for you and your frames.
I've been running XT 2x cranks on the gradventourer for years now. Until recently, I'd been using a Claris front mech with an offset shim to let it reach the MTB chainline. Have just fitted a GRX400 front mech with braze on adapter, and it reaches the outer chainring no problem without any mods.