That seems to have been a solution to the puzzle. I installed the Generations Galaxy Bridge and it seem to work. I've just played and it dont`t crashed until now. I would like to test it extensively. I'll report tomorrow.
But that's
truly bizarre as, unlike the TWOK bridge, there's nothing in shuttle sets that uses anything from GenGal Bridge (as far as can remember, and rechecking scripts this morning). Still, as long as it works...and maybe mods can move to solved problems?