Screw Star Trek I still want a Who/Blakes 7 crossover!
I would love to see some elements/settings/ect from Blake's 7 to be used in a story as an homage....
That happened all the bloody time in the 70s! They shared a lot of sets!
Crossover-wise, the books and audios have done several, with Chris Boucher bringing Carnell from B7 into DW.
Trek/B7 would also be interesting - I know you think "but the lack of aliens in B7 means it can't be the Trek-Verse" but you go and watch By Any Other Name and Star One back to back as a two-part story and see what happens...