I was waiting to see if anyone who knows more in this would answer. In the meantime, it is certainly possible to bring shipping assets into WOFF. Both games are based on CFS3, which had shipping in it.
If my hazy memory is correct, earlier versions of WOFF (OFF phase 2 I think) still had ships in it. OBD removed them for some reason. If there was some issue that caused them to take the ships out then that might be resolved now, since there are ships in WOTR.
That was my thought process exactly, as both games have the same engine, assets should be more or less interchangeable.
It is possible that WOTR assets represent WWII-era ships, and as such are not accurate - if that’s the case, they shouldn’t be added to WOFF. If, however, they’re reasonably accurate, they would definitely be a welcome addition. Even without special missions added to them - I sometimes adjust recon missions to include long patrols just off the Belgian coast, imagining that my observer notes all the ships, their positions etc. No special missions needed