Hello,
look, your solution is simply PC app created with some higher programming language (look what are supported as API with library or DLL, I’ve my C++) and installed on sim PC, this is best because you can then only use direct access to sim. If you then want some other more independed channels with Arduino (to me one is enough) you can have serial Port via USB on Arduino and also independed ETH shield attached to it. 2 independed channels for data exchange 