Glue the gasket to the manifold with Permatex 80062 High Tack Gasket Sealant and then gently tap the gasket along the edges if the ports with a ballpean hamer to cut it to size. You might need to clean it up a little with a sharp knife but it's likely that the hammer trick will do all you need.
I wonder if you could just find a fiber-reinforced material and use that instead of cork or whatever?
With the other tricks in this thread, that should ensure it comes apart and stays together
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