Re: 70 - aerosol? I find that unlikely unless perhaps a cervid sneezed in your face - repeatedly.
I would assess the risk of infection of contracting TSE from a cervid that has CWD as low. I don’t wallow in gut pits, or dress deer without gloves. Common steps to reduce exposure.
Yes, it’s unlikely but given as a remote possibility. The outcome would be bad enough that’s it’s worth the research effort to try and head off the threat or deal with it.