> Perhaps its not meant to signal virtue to the majority but instead to the decision makers. Perhaps the majority do not identify as a member but the members do.

That's not "virtue signalling." If everyone involved in the interaction is cynical about the organization, no virtue is being signaled. The "decision makers" most of all know the true nature of the party.

I think the word you're really looking for is just "signalling" or at least a different kind of signaling than "virtue signalling." You're really torturing that term into meaninglessness here.

"Virtue signalling" really only applies to situations where at least some people genuinely think they're signalling virtue or that others would actually perceive it that way. One end or the other can be cynical, but not both.