I would not give up!
Have her go to your current doctor, explain what you want to do and see if he/she is receptive to your/her plans.
Tricare Express Scripts work with many different pharmacy systems. There is a couple that they do not allow. One is Walgreens. They had some problems earlier with CVS, but I am not sure of their status.
We opted for Walmart as they were very easy for us anyway to work with on the road.
I only see me quack once a year, otherwise done via email. Wife goes every six months or less depending on lab work. We find a local lab that will do lab work and fax or email to the quack. Quack emails lab request to us or lab, we do tests and get results via email from doc.