Booney seems more likely to be set up as the next straw hat as a cabin girl
Bonney desire is her father. That will probably be resolved at the end of this island's arc. Unless he also joins, he will likely join the revolutionary army again, there isn't much reason for her to stay with the crew instead of going her separate ways with her father.
Vegapunk wants to go to Laugh Tale and asked to join Luffy before the trouble start. Only Lilith and Atlas are the only good Vegapunks really left. Atlas is too big so it probably Lilith.