Eric: Depending on how thick your kerf cut is, you can use a straight lamination. Actually, for this one I just created a straight lamination using a little jig (see below) I made and the tapered the end by hand on my belt sander until it fit snuggly into the base of the kerf. I didn't really set out to create a perfect tapered lam.
Below is a rough little mock-up of the jig I use to sand my kerf and underlay laminations thin and flat. It's obviously not to scale, but basically the little lip keeps the lam from shooting off the belt sander while the longer part allows me to put equal pressure on the lam, preventing me from sanding a radius into it.
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<--------------- SANDING BELT <------------------- )