Isn’t it possible to use 3PO to deliver the line in a way he would say “The Republic won’t send reenforcement/ships/fleet ? We are doomed !” ? (note that Daniels made 3PO voice in TCW, I wonder if someone familiar enough with the show would know if there is a line to be taken from an episode)
Having him ask that question out of nowhere wouldn’t work I think.
Maybe he could be the one who asks about Republic support but I think it’d work better if someone else were to ask that question.