I know there's a kit to make 'Fat Bars' (tapered handle bars on dirtbikes) fit a standard 7/8 mount and raise the bars about an inch or so, but I haven't really looked at the bars on the Vulcan to see if they might work there.
You can see them HERE. (I think the fat bars are 1in at the center section)
I'll check it out tomorrow and see if it looks like they'd work.
EDIT: I just checked the Pro Taper website, and believe the bars for those mounts are 1-1/8in. , not 1in.
Not to state the obvious, but you did think about the fact that you'll have to change everything (grips, switches, etc.) which is not an inexpensive proposition (and you have hand controlls listed in your mods).
Seems like I've seen a number of handlebar mounts which should fit...
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