Here's your homework for you. RFS (dirtbike) model forks shown on the left, adventure forks shown on the right. Assuming you use triples that are level straight across from the bearing seats to the clamps and of similar thickness to R-dubb's design, here's what it'll look like. With a 6mm spacer under the top triple (shown in pink), you're triples will be fully on the claming sections of the fork legs. The legs will protrude 29mm through the top of your top triple. You could make a lower triple where the clamps are lower than the bearing seat - sort of boomerang shaped - if you don't want the legs sticking so far out the top. Not ideal, but definitely workable.