Thanks again Aaron!!! I like long answers as long as they're informative.
Well, I knew about the less need of stopping power in the rear that in the front. That's why I was planning on using Sammy calipers and rotors in the back on my Kick as the front OEM calipers and rotors??? are bigger than the Sammys. The proportioning valve is mandatory as I want to be as safe as possible when braking hard as my Kick will be going fast (street use - whole 'nother story).
You talk about redrilling for a different bolt pattern, so I understand that you mean adapting the mounting plates to the bolt pattern of whatever other caliper aside from Suzuki ones. Are my correct on this? If so, you have answered another question I had. But this makes me wonder, is there any Suzuki model vehicle that has EB on the rear calipers? GV's, Swift's, Forenzas, Aerio's...

Maybe even the master cylinder could be exchanged.
I'll be checking this myself with a local Suzuki only salvage yard. If you know something, let us know.I will post when I get the info (probably this weekend).
Thanks.