So far I think Pinstripe is the only proven dominant ball python mutation. Chances are your pinstripe is a het but if you happened to have a homozygous pinstripe the only difference would be that all of the babies would be pinstripe.

If you go with pied as your recessive het there would be some chance that you could pick out the double hets (het recessive and het dominant) babies. I think it was Graziani who posted some odd looking pastel and spider het pieds so I arranged for one of my possible het pied (the closest thing I had to a breedable het) to be bred by a spider but I didn't see a particularly odd spider to pick. My girl might well not be het pied anyway but now I have a spider male long shot het pied. I've since seen pictures of for sure het pied spiders and pastels that didn't stand out as much as those first ones I saw so it's certainly not a sure thing. I think RDR’s lesser het pied was pretty striking so that might be another combo if you are interested in for sure co-dominants like pastel and lesser and not just known dominants like pinstripe or questionable reported dominants like spider.