you sure about that? i did a lot of research a few months back on crossing the 2 but i found it was not possible and was even backed up by sam skunkman himself he said he spent years trying to do just this and failed, and i seriously doubt anyone in the entire cannabis community has better access to legit facilities, lab eqipment and the knowlege necessary to pull it off. plus whats the benefit?
If you read the thread I linked to, including all the scientific research, you can guess my answer to that
Doesn't make cannahop a fact until it's actually done of course. For all I know there's another reason it may fail, but there is a viable technique to do it which is as likely to work as GMO. Instead of using artificial means to inject foreign dna, tissue from the contact zone of the grafted plant is extracted as that, opposed to popular believe, does contain mixed/crossed DNA. That is grown using tissue culture, and then 'some' of the plantlets can be a mix (there's a luck factor as usual, which given plenty of time and space can be mitigated). The technique is already used, it's a legit breeding technique, just not (yet or not yet successfully) for cannabis. 
yes grafting works but the question is will the scion (cannabis) grafted onto a hops plant produce viable hybrid seeds and as far as i can tell the answer is no but ive never done it and dont know anyone who has so thats 100% speculation on my part