I’d rather beef up the ground battle so that on top of the normal staff of the base which should be considerable an entire legion of the Emperor’s best troops is actually there.
So of like the reverse of when the elves come to Helm’s deep.
The Rebels have seemingly subdued the base personnel and have planted their explosives (though I would plant them under the dish instead of in the reactor) and then in marches over a thousand troops. With walkers and big guns and then the Ewoks and the Rebels win not because the troops are rubbish but because the Ewoks and the Rebels are better.