That sounds cool. I did something similar a couple of times last summer before class with another student.
My BJJ instructor teaches a whole bunch of other arts at his school (kali, muay thai, MMA classes), but no TMA (although he initially started his MA career with Isshinryu). When I told him that I was making a transition from doing TSD to just doing BJJ, he said "you had better practice those katas, though. Katas are the heart of your TSD." Pretty cool attitude for a BJJ/MMA instructor