There is no way you could get it down the valley; it is too enclosed and twists too much and even then you would just be a sitting duck for these guns.
Remove the military option. Like I say, this is a Sith base. It was designed to repel assualt from Jedi and conventional armies! You guys aren't going to force it with just a ship.
Indeed, I can see no alternatives. Ush probably has them, but I'm not Ush am I? 😉
How about if we threw a thermal detonator down, hold it in place with the Force, then rush in after it explodes? The only people down there that are really any good with the Force are Rah and Wraith. Galder, Chion, and Jolanta are crap Force users. If Master Marcus and Master Gundark and Roan hold it steady, then they have a crap chance of pushing it away before it explodes!