there is a rclone bisync tool by fellow rcloner @jwink3101
Beta Testers Wanted: New bi-directional rclone wrapper
bisync at github
rclone bisync by ivandeex · Pull Request #5164 · rclone/rclone · GitHub
tho rclone mount and syncthing should work.
try that on a set of test folders and let us know what happens.