Re: Blend pot question
In your case, I really think that a blender pot would be the more useful of the two since, IMO, having a position where you have the humbucker full on is the utmost. I don't think the effect of a pan pot on a single, split humbucker is really going to produce a terribly impressive effect because the coils are right next to one another.
In the end though, you might find that a "spin-a-split" is sufficient for your needs. You may discover that with a blender pot on a single pickup there might not be enough difference in the sound of the pickup coils to necessitate the ability to have either full on blending the other. Perhaps a spin-a-split with the top coil full on blending the bottom coil would be a better choice, also affording you more finite control since you'd have double the sweep for a single control over a blender.
A pan pot would be much more useful as a replacement for a three way switch in a two humbucker guitar, giving you finite adjustment.
Can't really begin to tell you how to wire up such a rig though as I've never done it.