Don't know how GIB supposed to bid, but pretty sure 3nt not the right call
It might be easiest if GIB just ignored the double. If not, if x = clubs, maybe xx = biddable clubs, p = pos/waiting, 2d = neg? Or pass showing clubs but not as good as xx, 2d = neg/waiting? After which opener can bid 2nt and resume a normal auction, if he doesn't xx to play?

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