It stands to reason that Devers would probably make a pretty good 1B. At least anecdotally, he has always seemed to have pretty good hands and range, but a not very accurate arm. Playing him at 1B would keep him from having to do what he does worst. He may take playing 3B as a point of pride, though, especially if he knows people are skeptical of his defense there.
As a side note, putting our eggs in the Triston Casas basket has had a number of ripple effects. If we didn't have him in the pipeline, maybe we'd just pay Devers what he wanted and move him to 1B right away, then get a 3B some other way. At the very least, we wouldn't be wasting ABs on Bobby D and Franchy.