We provide an X-Bb-IP header you can use instead of X-forwarded-For (which I think is the header name you meant - please tell me what you are trying to achieve, if not!). Those other two names will not work reliably as we use them internally (you’d see something like 127.0.0.1)
This doesn’t answer your question, @pixelastic - sorry I don’t know the answer but I think my more function-savvy colleagues will be able to help you out with that next week.