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There should be a magic headband of continued animation, that keeps your head alive after it is cloven from your shoulders. I imagine you would still be allowed to cast spells as long as they only had a verbal component and you could make perception checks, as long as you weren't face down in the dirt.This would also need the effect of the head crowing spiderlegs from its severead neck, giving it a climb speed, and then running around on them. Having the head dangling upside down from them.
Throw in a free high-pitched scream Shatter-effect every 1d4 rounds. Just for the "Oh my God! What is that Thing!"-Effect.
I like the way you think. And after the normal spell duration the head can explode into a swarm of spiders.
This should just be a cursed item that decapitates the wearer and causes all afore mentioned nastiness when its command word is spoken.