While I personally haven't done anything, I'm interested in the topic.

Truckinduc (if i got that right) has done some pretty wild stuff with his bike overall (front end included). you can look him up for more info on that.

A "number" of people swap out the front for 80's gs450/550 (i think) to get mag wheels (search for a topic titled "whale").

there was a bike called firelizard (don't remember the owner's name   ) that had a long springer front end.

I imagine if you find the right neck bearings you could make a lot of different front ends fit. that's all way out of my realm of expertise though. maybe some of the more heavy modders here can ring in and tell you more.

Thanks but the mag wheel is not what I want. I would like to keep the spoke wheel but have the inverted fork.