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I solved it by getting a GC license, a stable of reliable subs and building the work ourselves. ;-)
Admittedly, not a solution for most. It has, however, broadened my relationships with GCs whom I can feel comfortable recommending.
If they choose another, I insist on CA services of at some sort and explain why.
If, after rejecting us, our recommended GCs, and our CA services the client goes and chooses to pursue the work alone with a low bid loser, we're free and clear; our drawings carry solid references to any GC to contact us for any clarification, and our contract does the same with the Client.
At some point, we need to let go of trying to control the uncontrollable.