Bob Davis had an additional response:

There may be a marker in Georgia for the Troutman flag but I do not think on anything else connected to the Georgia Battalion. The Georgia Historical Society now puts out Georgia Historical markers and you can contact the GHS through its website. Maybe you could get the Middle Georgia Historical Society to sponsor the markers?

The Georgia Battalion Project

Refugio, Goliad, and San Jacinto: The Georgia Battalion in the Texas Revolution 1835-1836