Just MacGyvering here, but why not try making your own yoke using some Schedule 40 pvc pipe?

Maybe some 1" to 1 1/2 " pipe with a thin notch get the same in both ends. A little trial and error would get the right wedge length.

You could clamp your yoke pads to that pipe.

Similar idea, except this guy, used a round aluminum pipe he flattened on each end and bolted in, NO portage pads, pipe rides on pack. With a light canoe that might be okay? If you went with aluminum pipe, you don't bolt in or wedge, you get some Clevis pins for a quick mount/detach option.

Few bucks and a little tinkering you'd have something special.

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