Well yes and no, be careful at what you say While its true some manufacturers servos by factory default are reversed from some others. That statement above is not correct. I cannot speak for JR or hobbico or cirrus But I can say by actual experiance of deliberately using mis matched brands for the purpose of reversed function on dedicated and separate flaps that Hitc and Futaba servos are reversed from each other by factory default.

In that function the mis matched brands offers no problems however for Elevators which the question is about I would not suggest mis matching servos for reversing purposes. As noted by wild foamy.

Agine for the configuration of the OP's airplane its silly and pointless to throw money and complexity at a none existant problem.

Use the proper geometry.

John