I just submitted a run using the Hidden Backpack in Sunrise Isle, which is, in fact, accessible without hacks. See here:

https://strategywiki.org/wiki/Ultima_VII_Part_Two:_Serpent_Isle/Cheats

Considering the any% for Ultima VII uses the debug room, and the hidden backpack is much more involved than that, I'm sure it's legitimate for use in any%.

However, I propose a "No debug item" category be added, which would preclude the use of Cat Isle and Hidden Backpack items, which are obviously items put in for the developer's convenience, or for kicks, and are not intended to be for use in any normal playthrough. These are not used in the current (2h 1m) WR, which, I think, should still be considered a legitimate WR in a new category.

Thanks!