I don't see anything stopping them from doing so.
Effect on the metagame, faction dilution, passing up the opportunity to put that design effort into one of the many rebel shuttles in the EU, caring about theme (how many shots are there of the Tyderium dogfighting TIE fighters?) and that you've only got one pilot.
Stolen Lambda mission is fully plausible to me but I can't see it as an addition to the Rebel combat fleet.
Edited by TIE Pilot