Your wording is very confusing… You say you “do replacement file: where versions would swap out”… What does this mean exactly? Are you putting alternate versions on different tracks? In different positions on one track? Are you removing them entirely from the montage?
I think you would find people can help better if you explain in more detail. Chances are, Wavelab can probably already do what you want. Exporting multiple clips at once is something Wavelab excels at. It may be able to export all of your ALT versions simultaneously. I’m just having a difficult time understanding what you’re doing.
-Todd