Setting accurate angles on a bench grinder

[Jon Banquer]

Is there something available commercially for a bench grinder that’s more versatile than having to use this approach?

http://www.inthewoodshop.com/WoodworkTechniques/AngleSettingJigForDryGrinder.html

Or this one that only allows a few angles:

http://www.veritastools.com/products/Page.aspx?p=173

This is the only thing I’ve found so far that I thought was a decent solution:

http://www.inthewoodshop.com/WoodworkTechniques/GrindingNirvana.html