I found the root cause of the crashes with "MODEL.address.search.support_streetsearch_in_state()".
To find it I had to use a debugger and disassemble the ARM code: the function does not take a country as argument, but a state.
I could have saved an hour of work by using my brains first and interpret the name of function correctly: MODEL.address.search.support_streetsearch_in_state

So correct code would look like:
Code:
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This also means, sadly, that some of the (compiled) LUA code is incorrect and thus can not work as-is, and hence why classic address search does not work.