Yeah a red will make for a good pumpkin ale base.
Get a small can of Libby's pumpkin puree (non-spiced) and add that to your partial mash. Later, when there's only 10 miuntes left to the boil, add 1.5 tablespoons of McCormick's Pumpkin Pie Spice (I have found my absolute best results from using this instead of making my own mix)
Voila! Pumpkin Ale. You can even choose to nix the pumpkin puree if it seems like a pain to you. You don't really get very much flavor from the actual pumpkin anyway... the "pumpkin" flavor comes from the spices.