To me the problem with the warn mounting system is that it makes the winch sit real high. The top of the winch is level with the top edge of the hood. I have a pic somewhere and to me it looks kind of goofy. Probably wouldn't be to hard to mod a bumper that has it sitting between the frame.
The reason no one makes a bumper that fits it is very few people are willing to spend the extra coin for an 8274.