LOL
Even using a radiussed block that is matched to the radius of your fingerboard is a bad idea. The radius will be out by the height of the frets.
To achieve a consistently level frets, a radiussed block isn't going to deliver the results any better than a sanding beam and...I agree with letts, it potentially makes things a lot worse if uneven and inconsistent pressure is applied or the angle of the block changes slightly as its pushed up and down the neck. The longer the sanding beam, the better the results are going to be. I like the idea behind the Advanced Fret Levelling System too.
[url="http://www.ebay.co.uk/itm/TECHNOFRET-Advanced-Fret-Leveling-System-/180677811948"]http://www.ebay.co.u...m-/180677811948[/url]?
Having said all that, if someone likes medium to high action, they're not going to notice a lot of difference between a good and a bad fret job because the string height introduces a much greater degree of tolerance.