I'm interested too, I would like to buy this adaptor, or a beefed one, if the price is in the 20$ zone.
I've found this old extender among my MSX stuff. Though I already created the solution to connect 60-pin hardware to 50 pin slot (FLEX - FLexible EXtender), I've decided to create cases for the extender that was originally made by ImATrackMan:

That's how this custom extender looks with the 3D-printed cases:

The models can be downloaded from here:
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