The use of betadine is probably not needed in this case. Its use certainly is not as stated in post #2. Any Iodine would have to be in the developer, during development for the beneficial effect to take place.

As for PPD, it can cause dye formation but the dyes would be degraded and unstable. Much of the dye formation would go towards making a "bis" coupled compound, and I doubt if that would be a good dye.