Same direction I might go after looking into this some more in the last couple of days. I already have an R154, but I had planned to use it behind a slant 6 project (which isn't happening anymore). Recently, I have started thinking about using the R154 in my Duster which would allow the Magnum flywheel with the notches, but the balance is wrong for my LA motor. Also, I had originally wanted to avoid the heavy 143T flywheel, partly because I didn't want to use the big bellhousing, but I'm not sure it's as big an issue as I first thought. So, the issue for me is balance, still not sure how to work that right now.
If the R154 turns out to be bad, or grenades later, I will probably got to an MA5, too. If I ever get that far, that is.
Any pictures of your build?
FYI, rumor has it that an AY6 6 speed out of a 2010 V6 camaro will bolt up to the same bell. Can't prove it, so don't hold me to it.