Hi Tony. The other BA in my garage(in the 3rd picture) is my neighbor Jeff's.(people will remember him and his wife Irene if they've come to any of the SWTFs) I hold his bike in my garage because he doesn't have a garage at his house. And, Jeff's bike does have the floorboard setup. I just took a look at his bike and found that the plate which holds the master cylinder and the floorboard is slightly different than the one on the foot peg setup.
Now, you can see in some of the pictures that I did some cutting on that plate in order to make this new setup, however I think a similar kind of thing could be done with the floorboard setup, also.
You can also see in these pictures that I've rotated the angle of that plate clockwise down from about the original "1 o'clock" angle to almost "2 o'clock", though because the angle of the master cylinder in now at almost "3 o'clock", I only have one of the two bolts(the rear-most one) holding the master cylinder on. However, it still seems very securely fastened. I may eventually fashion a new plate out of a sheet of stainless steel to hold the master cylinder, but like I said, right now the whole unit seems very very solidly mounted.
Btw, I wish I would've taken pictures in the progression of this process, as I think this would have made a little sense for those contemplating doing something like this for themselves. Needless to say, I did a whole lot of cutting, bench grinding(especially) and drilling and tapping threads on a piece of billet aluminum which holds that plate and the brake arm pivot bolt, and which then bolted to those steel mid-pegs brackets I made years ago and which bolt to the holes on the bottom of the bike's frame where a center stand would go.