once it is bounced to a split mono, right click on it, choose Convert to mono.
I believe this will auto bounce it to one mono track.
back to my original question, you'd be better to use Melodyne as region FX, no ?
select the whole track / region FX / Melodyne.
then make your adjustment's, bounce to clips. done.
don't even need Melodyne in an FX bin.
I just cringe at bouncing to tracks for things like this.
if you ever want to revisit the track(bad mix, not happy) its gone.
its a destructive way of editing which in the times we live in now, theres no need for it.
I used to print reverb, FX,exc right to track back in the 1980's. ruined a lot of good recordings like that.
one cool thing ive learned from this forum is a better way to do things. not saying my suggestion is a better way. but don't be afraid to experiment, its the only way to leave your box and produce growth.
anyway. good luck with this.