You are kind of in no man's land. Any mtb 2x will probably be an issue if you want to swap the outer 2x ring with an outer 3x ring.
The SRAM X9 would probably work since it is a 42t and it is possible to get a 26t, but there are some issues. The BCD is 120/80 not 104/64. It looks like 120/80 is used on the 42t and 39t cranks and the 104/64 is used on smaller chainring offerings. I'm not sure anyone else uses that BCD so when replacement rings are gone, they are gone.
I'm not up to speed on the BB30 and the threaded work arounds, but that is a consideration.
If I were to go back to a 10+ year old mtb 2x, I'd probably look at an M785 or M985. As far as an FD, I would guess that an FD that will work with a 38t could be squeezed to go to 40t or 42t.
John