BID sounds like the way to go, thanks HWM.
Just adding that ImageHost Grabber works fine with (at least some?) imagebam galleries, but not (generally? at all?) with imgbox galleries. I've added bits of uncertainty there simply because I haven't done any decent testing,
I just know that I've succeeded with at least some, & maybe all, imagebam galleries & failed with most/all imgbox galleries.
I also don't have time to look at IHG right now to see if it's possible to amend its pattern/s to work with imgbox galleries. Simpler to just use BID if needed.