Attempting to bypass FE to lower RemoteEvent usage - how would you do it?

I am creating a RTS game that uses FE - but I am stumped on being able to handle things like clicking the mouse on the client with changes being made on server, without spamming RemoteEvents.

I attempted to set the player's character to the holder of the only things they can change - their units - but it still did not work. Here is an example.

If you're wondering, my test is sticking a LocalScript into the player and making it move the 'Marine' seen in the image I mentioned above. If I switched into the server window using the Local Server testing mode, the changes would, theoretically, be seen on the server since I'm technically doing changes to the descendants of the player's character.

This theory proved futile, so I was wondering if there are any other ways?

Thank you!

~TDP