Just found this post. Haven’t tried it but you could give it a shot.
Re: How to change timecode on quicktime source files?
by Steven Gonzales on Jun 20, 2005 at 10:24:23 am
If you need to change a bunch of quicktimes, you can use the free utility Sebsky tools.
Export a batch list from final cut, bring that in to Cinema Tools, tag all those files with the timecode you want in cinema tools, make sure the Cinema Tools records have the right file names to match your quicktime files, then export an ALE (avid log exchange) file.
Then you can use Sebsky tools, point it to the folder full of quicktimes, point it to the ALE file with the files names and new timecode which you exported from Cinema tools, and batch it all.
https://www.dharmafilm.com/sebskytools/