If I were going to alter the rake of one of my forks, the first thing I would do is draw it and the bike with CAD. Then it would be easy to see what the new bend will do to tire clearance, trail and toeclip overlap. (Doesn't hurt that all my bikes are pre-drawn, though without detailed fork info. I draw them to see what stem I need to get a good fit. When I am looking at a new potential, I show up with clipboard and tape measure, draw it up that evening and see if the needed stem will be reasonable.)

With an accurate drawing of the stem, with it's centerline shown as a "polyline", the new bend can be made on the drawing, Then it is a simple matter to check that the new centerline length is the same as the old. (The fork will probably get a little longer through the bending, but hardly enough to matter and probably not enough to even measure.

Gugie, if you ever want me to do this, holler. You know where to find me.

Ben