There are a couple options with the heel. I wanted to throw them all out and see which is the most popular option.
Option #1
Make another plate, just like the first one and stick Dynafit heel on top of it. The front two holes in the adapter plate would mount directly to the ski, the next two holes would mount directly to the binding via tee nuts, and the last two holes would be through bolted to the ski.
Option #2
Drill two new holes in your ski and install inserts. Use the rearmost holes from your existing Duke installation for the rearmost holes in your Dynafits. This might be the least complicated option, but it requires two new holes in your skis. People that want to reduce ramp angle might prefer this route.
Option #3
Drill two new holes in your Dynafit binding. I can already hear the grumbling, but take a look. We know the rearmost holes line up. So stick your Duke heel plate on the bottom of your Dynafit binding and see where you will be drilling holes.
Make a little mark where the holes will go with a sharpie and pull the plate off.
Take a closer look. Add epoxy to the bottom of the plate in the red area. Carefully drill the holes from the bottom up and use a pan head fastener with no countersink.
I don't believe there will be any interference from the brake or binding with the new holes or fasteners even if they are not flush mounted in a countersunk hole. There is plenty of height clearance as the binding moves forward.
So how strong will the plate be? The epoxy won't do much except help support the plate and help the fastener get a nice strong bite. It is reinforcing the bottom of the plate and displacing the downward pressure on the ski. (Don't forget that the ski really is part of the binding once it is all bolted together.) Also, if you look back to see how much material is actually holding the heel post to the plate, you might be surprised. Take a look at how much material is holding your Duke plate to the ski. It's the top half of a countersunk hole. Not much material there.
I'm confident the modified Dynafit plate will work, but I'm not sure it will be easier than drilling two new holes in my skis. I'm not too worried about drilling the holes in my Dynafits since they would be outside of the existing holes and heel post. The new holes shouldn't compromise the strength of the original holes or binding.
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