What base are you currently using for the xbox? With consoles you will need to have the pedals go through the base. Not sure on the setup of the HPP pedals but the USB board probably ain't going to work connecting to your wheel base, so will probably some need to fabamacobble something up
Thrustmaster/Logitech shouldn't be too hard to connect up other pedals as long as you can feed the base the correct voltage range for each pedal.
Fanatec is a bit trickier, you will need a CSP v1/2 PCB and mimic their pedal output, 3.3v = 0% 0v = 100% pedal IIRC (CSL Elite LC kit PCB needs a LC brake to work, the board has a hx711 LC amp chip so can use any 4 wire load cell plugged in RJ12 pins 1 > E+ 2 > O- 3 > O+ 6 > E- for those playing at home).