The alliance should attack with everything they have at hand.
The un-chromed naboo fighters could really work; though I'd have a squadron and not just "subtle one or two". Endor space battle is closing the saga and nothing should be subtle on it.
I'm even for adding old Republic junk ships, like early star destroyers of AOTC with some customization (heavy customization I mean, tho Im just throwing the idea here), or the shuttle in which Quigon and ObiWan arrive at the very begginning of TPM.
Other idea I had was to replace the imperial shuttle that the rebels use to infiltrate on Endor by an old Republic/ early Empire ship; having in mind that everyone on the executor gets curious about the ship, and the "old code" they use... infact, it'd make Vader's move by letting it pass, more obvious (though don't know if that's good).
Greetings!