Interesting question…
Should be fine. I use three external drives for 3 different Itunes libraries…
A possible issue.
Sync, specifically if automatic sync is on.
Any changes made it iTunes/RekordBox will cause the folders/files to be out of sync. (possible not meta data?)
Then Google Drive will start syncing.
Possible Solution.
Make sure Google Drive sync is off while playing. (Quit the Google Drive desktop app while mixing too!)
Then after playing turn sync back on.
You should not make any meta data changes in rekordBox either while playing..
Would love to see others thoughts..
Sounds like a fun little hack.
Cheers