Is this it?
https://www.eriksbikeshop.com/...shim-kit-pr3e10797/p

or this:
https://www.bikebug.com/...him-kit-p-49022.html

Yes, however when I tried to order from Erik's it said that they would not ship to me (PA), and the shipping for bikebug was $54!!!!

You could use canting wedges. Just use two in different orientations to cancel out the canting and provide a flat surface.

https://www.bikefit.com/...alkable-cleat-wedges

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ECMGN Therapy Silicon Valley:
Depression, Neurocognitive problems, Dementias (Testing and Evaluation), Trauma and PTSD, Traumatic Brain Injury (TBI)

I was wondering about something like these. They also have flat ones for leg length discrepancies. The only difference is that they are plastic, albiet probably hard plastic, while the other part is metal. Does anyone have experience with this working?

I have the bikefit wedges. They wear at about the same rate as the standard black speedplay base.

I have the wedges in my carbon soled shoes. They do wear, but have lasted five years for me. The two wedges approach is lower stack than using the leg length shims (though more than the stainless plate).

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ECMGN Therapy Silicon Valley:
Depression, Neurocognitive problems, Dementias (Testing and Evaluation), Trauma and PTSD, Traumatic Brain Injury (TBI)