While it has no appeal to me, because I'm OK with a foot shift and hand clutch, I have talked with riders who have installed and love the hand shifter on their Indians. [ The only thing "suicidal" about the modern device is that it does require removing your right hand from the right grip. And most of us do that regularly for whatever purposes that come to mind. ] They say that you have to back the throttle down anyway to shift, so moving your hand to the shift lever becomes second nature. And using the modern hand clutch [or, in theory, an old foot clutch] still works seamlessly, since it's on the left side of the bike. It makes a bit of sense, as long as you aren't big on using the front brake as your primary stopper AND you like to shift the tranny down as you slow the bike. Personally, I almost never use the rear brake, so having my hand on the front brake lever AND shifting down with my foot at the same time is akin to walking and breathing. I don't use the transmission for slowing, but my unconscious mind requires that while braking the transmission changes must be done together.
UPshifting by hand will be slower and less "seamless" compared to using your foot, but if you aren't in a hurry, maybe that won't seem like an issue.
An advantage to the modern accessory is that it does NOT replace the original foot-shift. So if a situation calls for foot operation, rather than the hand shifter, you can still use that method.