@SOTAham,
Technically, you should have minimal issues doing this, but you should expect some sort of hit to your performance as a result.
The satellite Decos technically operate as a Client of the Main Node - so as long as your main node and satellite can see each other on the network they will be able to communicate. You may have to do some extra configuration for the ports that are used for the Deco's Backhaul connection so that they may properly communicate - this would just depend on the capabilities of your system.
My concern with this setup would be the time it takes for the communications to travel through P2P and The Deco backhauls combined, as i could see latency issues arising. Honestly, you may consider looking at burying your cable as the ethernet connections will always provide the simplest and best overall experience.