Sounds like a great idea, it may not even be required to buy the rights from Ubisoft. Instead, approach them to incorporate the mods into the game as a re-release and take a portion of any re-release sales to support Subsim.
I believe this is what was done with CloD last year when modders did a significant amount of work getting the game to function properly. I think it turned out to be quite successful on re-release.
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