I still would like to be able to static/dynamic link grpc/protobuf for
my target using the SDK.

RIght, the "mingw32" override shouldn't affect what you do with the
*target* unless your target is MinGW; I'm not sure if anyone is actually
doing that, most SDKs target Linux for ARM, Linux for AArch64, Linux for
x86, etc.

What is your target?

It's important to remember that the recipe can be built differently for
the SDK vs the target :)