I am going to make a crazy prediction.
The Sox will trade Chavis to Pitt for Adam Frazier. Frazier is a good stopgap 2B solution, as he can hit a little, play above average defense, and, as he has some OF experience, can move into a supersub role if Jeter Downs forces the situation in 2022.
This deal also represents a savings of roughly $10mill for Pitt, depending on Frazier's 2022 salary. Chavis is not the primary need for Pitt, but he can help their weak 1B position as they dealt away Josh Bell, and if any GM in MLB has any faith in Chavis, it is probably Ben Cherington, the man who drafted him in the first round. Pitt probably prefers pitching, but I do not think they will get much pitching for Adam Frazier...
This deal does work on BTV...