I don't believe that an MAOI patch would be an effective route of administration for the harmalas if you intend to dose the dmt fumarates orally. In order for the dmt to pass the brain/blood barrier the MAOI's need to be in the gut.
The maoi patch would probably work for most any other ROA of spice whether it be sublingual, insufflated, IV or smoked.
As far as tolerance goes, and this is just my personal speculation, I believe if anything a reverse tolerance would most likely develop. If not a reverse tolerance then most likely no tolerance at all - meaning once you find your sweet spot, you're essentially good to go on the dose. Once again, this is just speculation on my part and I have no sources to back these claims.
Convert a melodic element into a rhythmic element...