I'd agree with Dubi that the Lebanese would be a good choice if you're looking to pass on CBD traits to hybrid offspring. CBD can vary from plant to plant so I'd pick a Leb female or male that's got a high amount of CBD. This is the benefit of modern genetic and cannabinoid testing; if you've got the $ you can send it to a lab and check it out.
Lebanese (and Turkish) has always been the odd duck of the cannabis world. Thin leaves, short branches, high CBD, grown for hashish, it's unlike any other drug strain. Moroccan is said to have some Lebanese genes in it. Some Turkish strains have been found to be Eurasian hemp.
I'm wondering if Lebanese is a hybrid of northern hemp strains from Eastern Europe and Asia Minor with eastern drug strains. This may have happened a long time ago, there are records of cannabis use in ancient Israel and Egypt. Perhaps the hybridization with ganja drug strains hadn't happened by that point. Probably just a matter of time before we find out, they have found hemp seed in ancient tombs. I'm very curious what the results will be.
Do the Lebanese still use cannabis for food and fiber? I've seen pictures of how much seed they collect when making hashish. (It's a lot) Maybe it's relegated to animal feed.