Uh, why not just re-sign Sano?
I mean, like Mountcastle, he's a right-handed hitter who can only play 1B. Mountcastle only strikes 171 times per 162 games, whereas Sano is much higher, but Sano has a higher OPS+ and more HRs per 162.
Said more succinctly, "No, thanks."
(And like others, I don't think Baltimore's likely to be trading him.)