Union: mkdir on limited remotes

I have multiple remotes pointing to the same GDrive folder, combined with union to bypass rate limits.
As GD allows making files or directories with the same name, commands like that would create multiple directories named test_dir if it wasn't previously existed:

rclone copy local_dir/ gdrive-union:test_dir/

This can be workaround by command like rclone mkdir gdrive-account-1:test_dir/ (assume gdrive-account-1 is one of members of gdrive-union) but it's tedious and consumes rate limits.
I'd appreciate if there will be a feature to limit mkdir on certain remotes to prevent from flooding with duplicated directories.

Not sure I'm following what the issue.

Can you share your union setup? A log with the issue?