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Your approach seems to be the right one. The Mapei should adhere well to any clean surface. I would not think that you should need to score the surface of the remaining underlayment for adherence.

I've had luck removing thinset with a flat shovel and in extreme cases, with a masonry grinder cup. A small 4" metal scrapper could also work to remove the thinset. The Mapei should work in this application, provided that the FFE isn't beyond tolerance.

Howdy - my name is Michael and I am excited to be a new member! I work in the field of architecture and, while most of what we do is ground up/purpose built stuff, we still do a lot of adaptive reuse and floor restoration is always a bit of challenge in those instances.