If you are comfortable modifying the registry, you can get a drive letter assigned to the fixed path.
Assume you want to use drive D: and your mountpoint folder is C:\Cryptomator-D.
The following registry script will assign drive D: to the mount:
REGEDIT4
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run]
“D Drive”=“subst D: C:\Cryptomator-D”
Adjust this for your actual drive and folder.
This is what I am using until this issue is resolved. Note a system restart will be needed to assign the drive letter.