According to "Grumpy", you don't even have to pull the gas rings off the bolt to make it work. He didn't take his gas rings off when he did his test with the DI Noveske (5.56) bolt:
HK416 /DI parts compatibility
And you're obviously aware you're going to need to tune this sucker since you're stuck with the HK gas system length. Were it me, I would probably get a Vltor A5 buffer on the back so you can tune there too. In theory, it should all be able to work, but I wonder if you're going to get this sucker tuned down enough that it isn't devouring bolts and trigger disconnectors.