For simple stripped lowers, I'm with trash panda. Nothing crazy, if anything at all, is necessary to protect anodized aluminum. I'd wipe them down with some oil, and zip lock bag them. If you want fancy, throw in a strip of the corrosion paper and vacuum seal them.
You'd probably want to turn the rifle on yourself after cleaning out 50 weapons of cosmoline. You'd probably need to stash a heat gun or toaster oven and gallons of acetone to clean up all that cosmoline too.
I suggest you go with the CLP and ziplock route, until you can get the parts to build them out. Test fire/zero, clean, then coat in hydrophobic grease (just the steel parts), and vacuum seal. If you take the time to paint the barrels with grill/engine paint, prep them by acetone cleaning then sun-baking or heat gun to about 100-120°, spray, and wait a day before final assembly, then you should never have rust on the exterior. Rustoleum grill paint is not readily dissolved by common gun oils/solvents or motor oil.
I've never seen anodized aluminum or brass corrode, even after salt water exposure. The bits where the anodizing is worn off? They can corrode like a sumbitch.
Iirc you can get ballistol in cans/bottles that aren't aerosol.