I think the idea to create a new Pirates company and have investors be shareholders is a good idea, at least for marketing your pitch to people who might want to donate money to you. It would be an extremely expensive venture, especially considering how Wizkids went under in part because the Pirates packs were so expensive to produce for the value they were sold for.
You’ll need to have a solid business plan worked out and an airtight case done before you go up to anybody with donation requests, much less the title-holder company. I don’t know if it can be done, but I would look into it if there’s no possibility of a comeback happening and you feel invested enough.