Welp, DP extension cable connecting my PC to the MST hub was the issue. Shame since without it my desk cable management will be horrid. Oh well, at least it works now and I know I'm an idiot for not checking...
You boot into Linux, then do sudo lsusb -v|grep -i switch and see if any of the ports mention that it does support switching of power. That said, in all likelihood your mobo will not support such. I am only aware of the chipsets in USB-hubs supporting this feature and I have not heard of any mobo-chipset supporting it.
Then, in the entirely unlikely case that the chipset actually did support it, you'd take a look at e.g. https://github.com/mvp/uhubctl and implement something similar for Windows.
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