as others suggest , going with Phil Wood BB is a good choice.

after mounting I NB, they have an extra mud shield to fit in the mounting rings,

Bene Sugg, slip an O ring over the spindle and that will add another seal potential

to force gunk, to pass through to get to Phil's Bearings.

He specifies a sealed bearing type, as used in submersible water pumps ..

IDK if you have a desire for the Andes passes , maybe a MTB 22,32,44 crank would be a better gear set.