Can the climber jetpack to a buried tile?
I would say no.  Other cases where players special abilities combine (Navigator and Climber) or where a player's special ability combines with equipment (Explorer and Dune Blaster) are explicitly mentioned.  The Climber says they can move to blocked spaces, not that they treat blocked spaces as unblocked. So I don't see anything that suggests you would be able to modify the jet pack's explicit statement that you can only move to unblocked tiles.