With some patience, some imagination, and a welder anything is possible man!
I havn't done what you are talking about, but I have some input. Build a winch mount that you can bolt your front bumper too. Kind of like a layered thing?
The innermost layer is the winch mount, built from plate and square tube steel. I'm envisioning a main plate to bolt the winch on, two perpendicular plates to bolt the the frame rails, and 1 or 2 pieces of tubing on the back/bottom for strength during angle pulls. Four tabs welded on the front to reattach your bumper?
Then you could bolt on your winch, then decide on a suitable way to bolt your bumper to the winch mount, then fasten your fairlead on the outside of your bumper. The challenge would be keeping everything tight and collected so your bumper doesn't end up hanging way out in front.
I kept the "wings" of my stock bumper and fasted them to my winch mount, but I bend the 'wings' quite easily, and I knew I would when I attached them. I just needed something to protect the lights and whatnot from smaller trees. I am going to reinforce them this winter with 2"x2"x1/4" hitch receiver tubing and then bolt the original bumper wings to the 2x2 tubing, (i plan to drill out the 4 holes and use about 1/2" bolts(?) perhaps carriage bolts, try and make it look badass) because trying to weld the front bumper was miserable, it was like trying to weld tinfoil. The rear is much more substantial.
Have a look
here.