[ovirt-users] reinstall hosted-engine with ovirt 3.5?

Due to a moment of idiocy I accidentally upgraded my hosted-engine vm to Fedora 22 and now ovirt-engine will not start, I was able to get postgesql up an running so I was able to make a backup of the engine. As far as I know Ovirt 3.5 is not supported on F22, so my options seem limited. 1, update to the 3.6 prerelease 2, reinstall the VM, if I were doing this I would use CentOS 7 my preference would be to fresh install the hosted-engine. I am guessing the way to go about this would be to shutdown the HE broker and agent daemons on all the nodes, possibly clean the metadata? and the do a hosted engine deploy as though migrating from an external engine. Can anyone comment if this is reasonable? Thanks, -Alastair