If you have the Xtreme model you can use the hand ball pump. Or if you have a regular model you could modify it with Vacu-Vin.
But honestly it works best with water, I wouldn't consider Bathmate as an air pump, basically the function / best use is in the name.
If you're considering the possibility for both hydro and air pumping, have a look in the MoS Shop for Mityvac.