109$. Calling range against likely resteal

[tinze]

Stars 109$. First hand in a new table, so no reads. Blinds 200/400 with 50 ante.

CO Hero, 7k
Button, 9k
SB, 10k+
BB, Sitting out

Hero opens for 1200 from CO, Button insta shoves, SB folds. What is our calling range here? Naturally Hero's raise looks like an attempt to pick up the blinds since BB is sitting out and buttons shove looks like a resteal due to the stack sizes.