I think the VS100 is pretty much a direct replacement - might need to slightly enlarge the hole in the top of the guitar, but I'm not 100% sure about that.
I liked your earlier idea about a Graph Tech replacement nut - better than faffing about with rollers - but do they make one to replace Wilkinsons? I know you can get a graphite replacement for a Floyd locking nut, but the Wilkinson sits 1/16" closer to the first fret (as does the LSR).
There's an Earvana replacement for an LSR nut, maybe you could get one of those fitted and have Feline (or someone) fit a little piece of maple behind the nut to cover the gap left by the Wilkinson?