I think found simple way around trench run issue UFP repulcation photon toropdoe pilot manual

[Jason 27]

Simple put it when near the excost vent another personal board the shuttle or Delta flyer. It not like Rebel base using UFP technology republication photon torpedoes  can be pilot manual from shuttle, Delta flyer  or even the base itself. Of course another option recalculation photon torpedo make the tight turns.  

[Tyralak 12,068]

The only problem is the size of a standard photon torpedo. Its too large to fit in the vent.

[Jason 27]

Ok micro photon torpedoes smell enough could be replication and piloted by someone on the shuttlecaft manual while fly into blow me up vent. It has fly slower make the turn different story.