The BRS is not an option, as the system has to be engineered as part of the airframe. You just can't buy one and stick it in like a new flight computer. All BRS installations I know of in gliders are developed with the aircraft manufacturer for a particular application. And adding one to a Standard Certificated glider would be a huge exercise in frustration with FAA requirements and regulations.

I was a dealer for BRS in my hang gliding days (as well as Second Chantz) and those were incorporated into the pilot's harness and as such could be retrofitted.