@Andru- not ridiculous at all, though I don’t have a good answer for you. It’s still in progress, with comments preventing the last big roadblock to a resolution.
Not that it needs more roadblocks, but is any consideration being given to any third-party add-ons that interact with the Gallery? For example, tags on gallery images that associate to the ID of the gallery entry. Given that the converted gallery entries will have new IDs.
I realize that you may not be able to say much, but if you’ve decided that it is impossible to take that into account, it would definitely be good to know.