I have one 20" HI chainpuri, and it drives me nuts. It came with a carved wood scabbard, and they carved the handle too, in two places about 5/8" wide and absolutely ruined it's usefulness. I can't swing it without the carving at the back abrading the heel of my palm, and the carving in front of the raised rings prevents smooth shifting in the hand of an otherwise marvelously light ( it makes a 20" Sirupati feel fat and clumsy ) and nimble fighter that begs to be used. But it's too pretty to remove and matches the scabbard. DRAT!!!
My two 17" chainpuri villagers are another matter, being uncarved and therefore smooth. The top horn at the back on the 14 oz. is small enough to not be obtrusive and on the 20 oz. needed only the least dehorning.
As the result of dropping ( and chipping the top rear point ) of a 19" chainpuri handled village Sirupati it's been reshaped to an egg shaped pommel area. I think this is my favorite handle for a working khuk. The extra-sized pommel area means that much more to grab when things get sweaty and start to slip.
( You are talking to a guy who grabbed the barrel of a 14" contender in 35 Remington that jumped out of my hand just before the front sight went past my ear. With the same sweaty hand it jumped out of. DON'T DISCOUNT LAST CHANCE SAVES. Don't count on them either, but... )
The early standard handles ( with scrolled buttcap ) either work for you, work for you with minimal dehorning, or you're out of luck. The later ones with flat sheet brass can be reshaped to a far larger degree. Because these tend to have either horn or wood handles where the chainpuri's only use wood as a rule, the difference in size between a WWII or AK of horn versus wood will be insignificant. Therefore their pommel areas are smaller, which I prefer on a fighter type blade.
On the ring, it depends. On a working blade, and properly placed and shaped I think it enhances control and safety.
What I'm gonna do with that accursed carved Cainpuri, ( yes, I spotted the typo, but it's too good a freudian slip to edit out ) I don't know. Maybe replace it with an ivory handle and havily scrimshaw the same pattern in brown ink, then inset a few pieces of ivory into the scabbard.
Enough pontification. I keep this up, I'll start thinking I know something about khukuries.