Does it really need to be a spline or could the joint be a standard woodworking joint and be covered with a decorative raised inlay to achieve the G&G look?
Make the project, cut the pockets for the inlays, make a inlay blank as Gavin says, contour the end of your inlay blank, cut the inlay piece off the blank and install the inlay.
That's how I would try to do it and just another way to achieve the look you want.
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