I have not used Midwest specifically, but I have mixed Brodak, Sig, Aerogloss, even forty year old Kempel dope with no ill effects, with the one caveat being nitrate may NEVER go over butyrate. Butyrate over nitrate, no problem. I think you should be okay.
The problem with Aerogloss white and yellow is that the pigments they use are transparent automotive pigments, and they need a ton of coats to cover. That's not the end of the world with a solid balsa 1/2a CL trainer, but it could easily add an ounce of paint to the plane. I would spend three bucks and get some Sig or Brodak. Preferably Brodak. You will get a good finish in two coats instead of ten. If you prime the thing white or silver first, that really helps, too.
The darker colors of Aerogloss are not a problem at all.
People from way back remember Aerogloss being great stuff in the fifties, but the formula has changed over the years. I have used NOS stuff from back then, it smells different from the new stuff. I only have dark colors in the NOS, so I cannot say if the white was any better back then.
But Brodak(and to a lesser extent, Sig) is like night and day.
Any of them are sprayable.
I did a scientific little mercury a few years back. Took about fifteen coats to get a decent yellow finish with aerogloss. Came out heavy. Gloss ended up being deep and nice, though.
Did a Yellow Aircraft A-4 Skyhawk with Aerogloss white...after at least ten coats, I was STILL not satisfied with the finish.