The Bruins could simply decide to pay Miller to stay home for this season and then buy him out at the end of the year for one-third of his NHL salary. According to Cap Friendly, his NHL case salary is $750,000, with $95,000 in signing bonus money and a maximum of $105,000 in performance bonuses for the 2022-23 season.
The Bruins could work with Miller, agent Eustace King and the NHLPA on a settlement that would allow him to become a free agent. While Miller is in the AHL, this would fall under NHLPA jurisdiction.
The Bruins or the NHL could seek to terminate the contract because of Miller's history. The collective bargaining agreement gives commissioner Gary Bettman powers to expel a player from the NHL, for example. But a source told ESPN that the NHLPA would be expected to file a grievance in this case. The same goes for any kind of multiyear suspension to essentially nullify the contract.