Oddly enough, some folks like doing this because of the dopamine hit of really understanding how something works. FWIW I'm that kind of person :-). But I certainly understand it isn't for everyone.

The platform I've been using to explore stuff like this is an Ultra96 board with a LimeSDR as the receiver. The Ultra96 has the Zynq Ultrascale FPGA on it. Given that USB3 latency is < 10 uSec I am guessing (hoping?) I can implement it in the Ultrascale fabric which is fed IQ data from the USB 3.1 port.