This is required for the official reference letsencrypt client in EL6.
I'd be happy to take this on if someone could grant me access.
Created attachment 1105993 [details] root.log from the failed bug EPEL6 is a legacy distro. Just a brief try on Koji shows that building pyca for EPEL6 is a huge undertaking, which I don't think I would like to do for EPEL6. You are free to try it on your own in https://copr.fedoraproject.org/ and if you provide me with well prepared set of working packages, I can try to put them into EPEL6 (or help you to communicate with maintainers of other packages), but I don't think I need to do it on my own.
I will gladly reopen this bug when provided with the abovementioned set of packages.