Nice one, on St. George I don't know best bike split, but I would suggest having a look at the St George bike route, if available? It'd be nice to know where the little hills are. I would NOT recommend sitting through the bike course of IM Copenhagen, it's basically flat as a pancake. The mountains I know are pretty regular in the profile, and hence pretty boring on a trainer... Well, except perhaps Col du Glandon. That's a 1½-2 hour climb with a bit of undulation thrown in.