I have had four of these drivers I killed two of them. One with a 3xMT-G2 it was freezing up on high and then simply went dead. The other one I killed running a 9x the same way. I’m guessing you could get away with running one MT-G2 with no problems but toss in an extra 6 emitters and I think you will run into problems. I also killed two other IO drivers that use the same protection on the 3X. The 9amp one and the 3or4 emitter 5amp one.
Now granted it might take less power to run 6 XML’s and one MT-G2 but from my experience with this driver I wouldn’t bet on it.
I’m not saying don’t go for it. If it was me I would probably try it and see what happens. If it does work I would use it very sparingly.
I’m not sure what driver I would use as a slave because I haven’t used any smaller drivers on my MT-G2’s it would have to be a three mode driver that takes three cells obviously.
You could check out this thread on MT-G2 drivers and ask for advice on that thread.
Good luck I look forward to hearing your results. It sounds like a really fun mod.