Dear Bmcgin,
Welcome back to our forum, I would advise you to implement SpeedFusion (SF) to connect the two headquarters, you can define what traffic you want to go through that SF tunnel but it would work very well for you to be able to connect to a single headquarters and from there have access to your entire network or communicate between sites if you want it that way. I send you a link where they explain better what SpeedFusion technology is and how to configure it