Ok. Sorry I don't' have a better solution for you.
Though, if have Pages, you could have a document open in it at the same time, and just switch back and forth to copy and paste. Pages has the same pallet problem, of course, so if one of the templates does not contain all the colors you want you're back to making your own style sheets before hand by borrowing from multiple templates.
Then again, if you are doing this a lot, I have to assume you've got a style worked out (or should), in which case creating a style sheet in Pages would be a one time operation, and might save you a lot of work in the long run.