It sounds okay on the surface but when push comes to shove, I would prefer my opponent be able to ask for an undo rather than they resign because of one game wrecking misclick or mistake. If you wish to limit it to misclicks perhaps the new move would have to be played adjacent to the undo. Whatcha think?
I’m not actually opposed to your suggestion. I just wouldn’t ever use it and I’m a little wary of having too many setup options that might be overlooked in the rush to accept a game before it disappears.