I've never met a custard I didn't like. One time when I made pumpkin dinner rolls, they came out OK, having a lovely pastel orange pumpkin color and good texture. However, I had intended to add some pumpkin spice blend, but forgot. Nobody could tell they were "pumpkin" flavored. I think people (like my mom) associate the blend of cinnamon, cloves, ginger and/or nutmeg as the "flavor" of pumpkin.
Thank you for sharing your recipe :)
Best wishes for a Healthy and Happy Thanksgiving!