Create a kernel module, which provides a virtual alsa sink, which transmits the audio through the air.
see https://github.com/bmwiedemann/PiBits/tree/master/PiFmDma (code uses less cpu power) and https://github.com/f3l/raspberry-tx
I anyone is interested (and knows enough about kernel devel), I can assist with a raspberry and some radio meassuring equipment.
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