Juggling Topicals

I'm not looking to shoot up the Norwood classification so much as consolidate my existing hairline. It's scarred but there are plenty of vellus hairs which would make all the difference were they to grow and darken. Ultimately, I'm looking for a discreet solution utilising the following three topicals (incidentally all known to help scars):

White iodine
Magnesium Oil
Papain/Bromelain

Currently I do the iodine twice a day (leave in) and apply a papain/emu oil/water paste for an hour once a week. Mag Oil seems like a good addition to this.

How should I rotate them? I'm thinking maintain the status quo with iodine and papain applying Mag Oil on the 6 non-Papain days an hour before showering (I hear it'll absorb and just leave a residue by then). Does anyone know of contradictions/hints to maximize the impact? I know not doing enough is like doing nothing but don't want to compromise my passable hairline by overdoing things.

Thanks.