Originally Posted by Chris_W

You can put a 2.5mm spacer behind the DS bearing cup (which come with many MTB BBs to allow installation in 68mm BBs instead of 73mm), and you should still have plenty of axle sticking out of the NDS to attach the HTII crank to. I've done this to tweak the chainline on one of my bikes (105, 5600 crankarms on both sides), and have had no problems after 4000+ kms. You can also add a couple of pedal washers behind the right-hand pedal, and still have plenty of thread engagement (on my setup, I put these behind the left-side to compensate for the BB spacer). Doing both of those things should move the RH pedal out by about 5mm, which is hopefully enough to make the offset not noticeable.