Yes a rotor will work with the forklifter, but just barely.
scroll down and see pic. Forklifters
already raise bars high...you're looking at some very high bars. Also, the little piece to stop the rear cable that mounts between the stem bolt and the stem might be a tad tricky to affix. You
could drill a hole and put a barrel adjuster in, but it's a shame to do that to a NOS stem. Gyros are good because you can insert your stem a LOT more into the forks and keep your bars reasonably low. If you are doing an RL 20II, it may take some patience/knowhow to get the lower gyro cable-stop piece to fit over/around the wrap-around toptube. If this is the case, look up Mr. Furious for advice -- I believe he's done it.