I'd probably skip the pumpkin altogether and just use the pumpkin pie spices, add a half pound of cara 20L for the honey-like sweetness and use a low attenuation yeast, like windsor. The low attenuators would serve a malty beverage like this a little better and leave behind more of those malty sweet flavors.
I also might be tempted to use some low alpha acid hops for this one like hallertau, willamette or saaz for some earthy floral notes.
Beer so good, it's frightening.
2014: Seven Heavens Series One: Vilon, Mystic Melomel, Skeeter Pee.