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Very interesting idea... Unfortunately the processing for AM and FM is different so this is not as easy as it seems. Running 2 copies on 1 system could be the solution, but you cannot use ASIO from multiple programs simultaneously, so to make this work it HAS to be done in one ST instance.
Giving up the Asymmetrical output would solve part of it (there are AM purists who believe that asymmetrical modulation is harmful to audio quality anyway) and moving the frequency response filter to the output side of the equation would solve the AM bandwidth issue. Whether it could be used to feed the same processing with separate frequency response limits is the question. If the filter killed everything above 10khz, the stereo pilot, 38K subchannel and RDS could in theory remain operational without ever reaching the transmitter. I'm not sure how many would ever use this but I could see those with AM/FM Part 15 systems in the US taking advantage of it. And there are some AM/FM simulcasts here as well.