Time box it, make it role-specific and make a condition of sole representation be that they are on the PSL of ClientCo.
"I am happy for AgentCo to represent me for role xyz at Clientco, subject to them being on the preferred supplier list at Clientco. This acquiescence is valid for x days."
"I am happy for AgentCo to represent me for role xyz at Clientco, subject to them being on the preferred supplier list at Clientco. This acquiescence is valid for x days."
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