I love this idea! The great thing about experimenting with curds--unlike many pastries--is that while you are mixing the sugar, butter and juices, zest etc. you can adjust for taste and color. Especially if you are using gelatin. That is, you can always throw in more sugar or juice to suit your tastes. If you're concerned about not getting enough pom color, might I suggest displacing some of the lemon juice with zest and replacing it with more pomegranate juice, effectively increasing the amount of color/pom flavor in recipe.
Please let us know how it comes out.