Thanks for your help. Well I live in Edmonton and there is only one shop with any real grain selection... and when they're out of something it takes a few weeks to get more (unless I mail order, which has its own problems).
I got a kilo of their chocolate rye. I think I'll try and sub with that... but maybe with slightly lower proportions than chocolate barley. I also plan to add vanilla, coco and cinnamon to the mix. any thoughts?