First - there's a lot of questions asking how to playback audio stream through multiple devices, and this is not the goal of this project.
With that out of the way - the real goal is to use multiple different stereo or mono devices to make a "DIY" 5.1 or 7.1 surround. For example, I have my studio monitors, Bluetooth subwoofer, a pair of cheap speakers and pair of speakers built into my monitor. I want to use the SW as an SW (obviously), SMs as my right and left speaker, the cheap speakers as my rear left and right speaker and the monitor inbuilt speakers as a single-center speaker.
Also, my computer doesn't have enough jacks to do this, so SMs are connected to a studio audio interface, monitor speakers are over HDMI, woofer is Bluetooth as mentioned above and the rear s. are connected to the headphone jack.