How will that prevent air bells? If you get air bells in the developer, the damage will already have been done by the time you get to the rinse/stop bath. The way to prevent air bells is to bang the tank down fairly hard a couple of times onto a folded towel or similar, just after first filling. This is processing 101. Rinse or stop bath? Makes no difference really, only to the lifespan of the fixer. If you're talking about getting gas blisters from mixing developer and stop bath, then you're using far too strong a solution of stop bath! And in over 50 years of developing film, I've never seen gas blistering on any film. P.S. the extra overhang, ridge or lip on a plastic spiral is more likely to trap air than the cleaner lines of a stainless spiral. So if you are finding air bells an issue, ditch the plastic tank and get a stainless one. And knock it down on the bench a couple of times after each agitation.