Merging Audio Files In Final Cut and making Quicktimes

I am a Resolve user but use Final Cut for syncing field recordings with my rendered QuickTimes. I usually merge the two files and give the FCP project to the editors or if its Avid I give the editors the Avid bins with the video DNX files linked to the audio files. This project I am working on they want the QuickTimes separate in a folder without going thru FCP and we are not using Avid. The question I have is there a way after merging the files to not have to render them out to another QuickTime? I am not sure if those merged files live anywhere on my drive. If I have to render these all back out its going to take a lot of time as I have 23 hours of footage. What would be the easiest way of doing this?