issue with new circuits

Our network layout

Mikrotik router > main tower backhauls > ap’s>customers all routed also has rip “I know”

We added new circuits at out new office today and I want to load balance customers between the connections.

I was planning on creating an eoip tunnel from existing mikrotilk router to new mikrotik route and then drop the new office end in a bridge on new wan. Then I was going to drop the bridge on the exisiting mikrotik router and create new interface with an ip from new circuits. Then load balance on them. Next week we will be removing rip and converting to ospf but would like to give our customer access to the new bandwidth for the next few days.

Any thought or suggestions

Thanks