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Robs idea definately sounds like the go, but I gather from your later post you are thinking of getting a number of smaller wedges. If so I would suggest they only be a temporary trial run.
To maintain the stability of you mount and to reduce the likely hood of flexing of the base of your superwedge (especially for imaging) a full plate wedge be made for the top of the tripod. There is a lot of weight in that 14" to be swinging around the place, a lot of tension and compression is going to be put on the base of the superwedge. if for no other reason than peace of mind I'd seriously consider the solid wedge. Just imagine one of the smaller wedges "popping" out one dark night while you are slewing from one side of the sky to the other.
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