I suspect the next year or two will see some changes in attitudes towards Reserve CSS soldiers. Smart Reg F bases will realize that employing Reserve techs, even in the limited manner that class A permits, will enhance their throughput - and if it's "skills maintenance" funding paying the bill, it's free to the base.
I know in Ottawa, for example, the local Svc Bn can send Sup Techs to the base to assist in kitting out new recruits, and work is under way to get Veh Techs and Wpn techs doing some work as well. It requires leadership engagement, and abandoning the "us vs them" mentality, but very positive things can be accomplished.
In fact, I recall seeing stats from a few years ago that showed that the two Army Reserve units with the most parading soldiers were the Svc Bns in Quebec City and Montreal - they supported the local CBGs and relieved pressure from the Reg F support units - a win/win for everyone. All it takes is command engagement and a bit of common sense. (And a desire to give soldiers more than IBTS, WHMIS and ethics lectures).