Or purchase
S-70i Black Hawks which are available from Sikorsky, and select options which would make it most suitable for embarking on/deploying from ships.
One thing I do feel needs to be pointed out is that there can be training and support synergies with two different Sikorsky Black Hawk/Seahawk helicopters in service if they use a Common Cockpit, and they already use the same engines. Given that the US Army is expecting to keep versions of the Black Hawk in service until ~2054 then I would anticipate production would continue for at least several more years (10+ if I had to guess) and that new developments/upgrades will continue to come out for years to come.
One thing which does irritate me, is that the MRH90 purchase (again) seems to have been a selection that on paper looked good, but now with hindsight it seems as though either not all the relevant information was examined, or some of the data was more aspirational as opposed to actual.