ideally the iodine can be recycled in this reaction, of course in practicality lets say you recover 90% of it per reaction, that would take you about 6 reaction cycles before you lost half of it.
so iodine shouldn't bee a major problem.
lets say old macdonald had a farm, and needed to castrate a few hundred pigs, a huge jug of iodine tincture wouldn't bee so out of place , in fact you might take an educational visit to your local farm supply store. although they might bee suspicious if you have a mohawk and black eye shadow on or something of the such.
what i see as more of the limitation of this process is the (psuedo)ephedrine, both in terms of their cost, the fact that stores limit purchases, and extracting the pills from all the denaturants they put in.