Not trying to talk you out of your preference, but FWIW I too have been quite happy blowing mine up with lung power. I've spent quite a number of nights on different air mattresses in differing conditions, and don't feel that water vapor in the inflatable is any significant issue.

One kind of odd "benefit" (?) to blowing up a decent sized inflatable is that I find it to be somewhat of an objective read on how tired I am, or at least relative to current elevation and my adaptation to same. I.e., the nights when I feel a bit light headed or even faint when blowing it up are pretty much one-to-one those times that I've really pushed myself during the day.