If it were me...I'd get another barrel ....in fact that's what I did....
Colt never built a 44 Navy ( they did do an experimental 41 cal. as seen in the NRA collection @ Springfield Mo. )
Granted this is 2018 and history & the CAS game VS what the replica's are today may clash...still I wanted a . belly gun on the Navy frame that equaled 36 cal. in my case.
So I started with Pietta 61 Navy and bobbed the barrel to 3" ...then purchased a 51 Navy barrel had it lined to .357
now two guns in one....
get a 44 barrel and have it lined to .357 add a Kirst Cylinder - cut the OEM to 5 " leave the lever off and Bob's your uncle.