Holy smokes $280 for a square taper crankset in 2022? What kind of rip off is this? This is just a generic Taiwanese OEM part with a special logo stamped on it. The chainring doesn't even match the spider. This is literally picked out of a Taiwanese factory catalogue.
For that much money you could get an entire new Deore mountain bike groupset to throw on the bike.
AFAIK, the Diverge uses drop bars and the owner wants to keep using them. Even though the Deore MTB group set is a good value, it wouldn't work in this case.
Probably the best value is to find an older used MTB triple crankset and to swap out the rings to whatever low gear the owner wants. But some people like to save the hassle and buy something new. The Rivendell crank isn't the cheapest but it'd likely work really well for what the OP was looking for: a 2x crankset with a smaller inner ring. The large bash ring will probably work with the OP's existing front derailleur.