Gregg, Joe, I think you're right on the blued guns especially, including my 4-5/8" - I thought of. Standard old Vaquero/Blackhawk hammer and still considering doing that to the above gun, but the SBH came along - and the "longhorn" New Vaq hammer just had to go. Because it made them twins, putting the polished Montado hammer on my SS .44 Special shorty (Sheriff) to match my .357 Montado was a natural, essentially making for a .44 Montado.
Otherwise, like you, I like the old Vaq/BH high hammer transplant on the New Vaq idea as I see a lot of others do too.
I should add, I too think I like the profile (side view) of the "high" Blackhwk/old Vaq hammer better on a lot of NV's, but the wider thumb purchase on the Montado/SBH sure is nice. And, I like the feel of my Colt's and USFA's hammers better than either the Vaquero/BH or NV hammers.