This isn't unlike how I step up my dregs when growing cultures from a bottle-conditioned beer. I keep about an ounce of the beer along with the yeast dregs and add an equal amount of 1.040ish wort to it. The end result is a 1.020ish starter with half the ABV of the original beer, plus a reduced pH. For hopped beers, you get half the IBU's as well. That helps protect the culture so unwanted microbial growth is suppressed.
My only concern with airborne innoculation is that the innoculation rate is so low, that the ABV and IBU may slow the growth of your desired innoculants, too. If I were doing it, I'd consider just lowering the pH to 4.5 with some lactic acid and rolling the dice with no alcohol or hops. This would make an interesting side-by-side if you're going to go through the effort, though. You could add a few hop pellets to one starter and boil for 10 minutes or so. Another could have a small amount of vodka or Everclear added to hit 3% ABVish. Then a control, and possibly a pH-adjusted batch.