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Could one make this plugin work at runtime in C++? Without the import window obviously. And does this come with the C++ source code? Thanks.

I'm afraid the code (and general workflow) isn't fast and performant enough to work runtime.
HammUEr comes with the source code for the Unreal Engine facing part, I'm afraid the actual conversion code isn't supplied because it uses some proprietary code I can't distribute.
Sorry.