The problem there is you have so little to build a stealthy raid of a well armed fortress with and it isn't the sort of story the dialogue suggests.
The story as it stands is a trap which backfires on the trapper due to vectors not deemed worthy of consideration (specifically the Ewoks and Lando). It's more like the end of Dune where the uncounted, supposed savages topple every arm of an advanced Empire by their familarity with their terrain and not being considered a threat.
The Empire always make the mistake of ignoring the small in favour of the big (that's how the first Death Star was destroyed).
Because that's the story as it stands the shield base has too look relatively unprotected, the Rebels have to pretty much walk in to get captured so changing that story into the sort of scenerio you suggest would require a remake (arguably the rescue of the Princess in ANH is that sort of story and there just isn't enough footage to build that kind of tale on).
Keeping the story as it was but enhancing it to the point where it makes more sense seems more doable.
The number of troops and equipment that await the captured Rebels when they are lead outside (and I could never figure out why they were lead outside in the first place but that's another problem with this act of the film, perhaps dubbing in a voice calling for the other Rebels to surrender or their leaders will be executed would provide a motive) is too small.
It's exactly the amount of troops you would expect to based at the shield complex anyway and not as the Emperor suggests an entire Legion of his best troops on top of those who would have been there.
The Ewoks have so many traps already laid it doesn't make sense that they could be there overnight. The only way around that is that they have already been planning to attack the base and have already been killing the Imperials.
The flaw in ROTJ isn't so much the story but the execution of it, it lacks due scale and the focus is in the wrong place.
The Ewoks don't really defeat the Empire, the Empire's own hubris defeats them, they throw all the technology and troops into the battle but refuse to acknowledge the little people.
Also it's much easier to add more troops, Ewoks and model elements into forest footage three decades on than adding more Carrie Fisher and Harrison Ford into sets.