VOY could have had Raffi and Seven on board, and Worf could have been stationed on the Defiant with someone else (perhaps Troi).
In fairness, I think this would have been the most logical/sensible thing to do, and I think most of the background for both the VOY and Defiant could have been CGI-ed (with main focus on the ENT-D bridge)... but its probable that they hadn't done this due to budget constraints and a relatively small amount of time we would have spent seeing those.
I mean it def would have been cool to see the different starships from the 3 main series in this timeline all together at the same time and then the different bits of each shows theme playing as one goes past and lets off a strafing run or something.
Possibly even have the first insertion into the Cube not be able to transport because of borg interference but the D has no shuttles so finally the Captain's Yacht is used in order to get into the Cube
