I think his glove, range, and arm play better at 3B, and I think he can handle the position better than Devers (even with the leaps and bounds Raffy made this year). Dalbec has some overall good minor lrague numbers, but at the plate, his swing and miss tendencies might become a major issue. However, if he hit at 3b, at least he is contributing defensively.
As for playing 1b, certainly. The overwhelming majority of the chances for a 1b are balls thrown to him i.e. meant to be caught. Outside of catcher, this is the only position that can make this claim. That's why most questionable fielders are moved to 1b. If you look around MLB, most first baseman fall into at least one of three categories - (1) left-handed, (2) very tall or (3) moved there because they were lousy defensive players somewhere else.
But if Dalbec struggles at the plate, why put him at the easiest position to field?