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That sounds a bit unrelated to this whole revision, ngl.How would we treat universes with short-cuts/passages (not different/alternative dimensions) that allow for FTL and/or time travel?
For example, warp space isn't an alternate universe, but it's mostly separate to the regular 3/4D universe, and vessels can 'drop' in and out of it (the same terminology used for Hyperspace travel in Star Wars, and Vortex travel in Doctor Who) for casual travel across decades and galaxies.