Very interesting cross. I think you could get a good yellow shrub from this if your lucky.
Given what I know about Westerland, I'd say the odds are good that well-pigmented orange/yellow seedlings will result. The question is, how many, if any, will be repeaters? And as this is the first time I got enough pollen from Marianne to use AT ALL, it is a complete unknown as a breeder. Will it make junk, or jewels? Many unanswered questions. I bet the seedlings will be VERY hardy, though! (And vigor like no tomorrow)