I just made a similar spiced cyser, myself; probably more like taishojojo's. The differences in mine were that: 1) I used half your amount of ground cloves and replaced that half with allspice, 2) I had 4 cups of 1/2" baked pumpkin cubes in the primary, 3) I used 1/2 tsp ground cinnamon, and 4) the big one - I added the spices in at secondary as part of a "tea": the spices steeped for 15 min. in a 1/4 cup of freshly-boiled water.
A few different variables, but I'm still interested as to how your batch turns out. I don't think the pumpkin will play a huge role... a slight vegetal flavor, at best. I'm most curious about how the timed addition of spices and steeping/direct addition of spices play out in the flavor profiles.
Good luck and happy brewing! I'll be tuning in now and then to see what's good.