My wife and I have Scorpion EXO-100 half helmets, and I was able to attach the H-D headset to them. This required attaching the soft lower ear cover section via zippers to the helmet, which turned out to be comfortable even in hot weather riding. The speakers were a very tight fit into the pouches, but I managed to squeeze them all the way in. The boom mic assembly did not fit onto the side of the helmet, which is just too thick. I ended up attaching it to the left side strap - the mic was a bit floppy but it seemed to work pretty well.
Unfortunately, the added mass of the speakers put too much pressure on my ears making wearing the helmet uncomfortable. It was worse with sunglasses. It's a great helmet and I really like it, so I ended up removing the headset.
I have since purchased a set of Nolan N43 Trilogy helmets with the J&M 629 wired headsets and lower cord. Since the headset is made specifically for this helmet, the fit is perfect and everything works well. I still wear the half-helmet from time to time, but the Nolan gives a better sense of safety and security.