Yes, you could add a little extension off the fin root and get it stuck to the motor mount...
Thing is, the idea behind the rocket is for it to weigh as little as possible. The cycline3 MM is very light and as strong (or stronger) as the "tradtional" method. You do have to add nose weight to the kit when built stock. I'm afraid that modifying the fincan (making it heavier in the process) will reduce the desired effect of the rocket. I don't plan to take it to the extremes anyway so I think I'm going to build as stock.
I'm almost tempted to put a 24mm mount in it instead....
N