It's really going to be a try it and see kind of thing, and report (if you want to!) your findings!
I've seen an R5K with a Gull-Arm, and it worked well, although did look a little high on the back end. Unfortunately, it was about 15 years ago, and I can't remember if it was using an MC21 or MC18 rear wheel.
A member on here tried to fit a Gull-Arm to an R6K a few years ago, but complained of the same issue, but never got round to fiddling with different dog bones, link plates, and wheels, and just reverted back to the R6K arm.
I've seen photos of an MC16 with a Gull-Arm too, but again, can say nothing more than it has been done in the past. Certainly, no-one that I know of who's currently active on the forum has done, or attempted it.
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Andy.
NSR-WORLD.COM
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