I edited my comment to make it clear it was just F-35 engines that couldn't fit. But I think the rest stands true. There was no V-22 COD variant at the time a

I edited my comment to make it clear it was just F-35 engines that couldn't fit. But I think the rest stands true. There was no V-22 COD variant at the time and the main COD aircraft couldn't deliver replacement engines. Other helicopters could deliver replacements to the carriers, as you said, but the carrier would have to be relatively close to shore. Other side note: the V-22 isn't pressurized, so they have to stay at a relatively low altitude.