The ability to delay this message on join by seconds/ticks would be nice:

versioninfo:
active: true
max-version: 47
interval: JOIN
message: '&eUnchainedMC &7> &fWe are running running Minecraft %version%. The best
gameplay experience is only guaranteed if you are using this version.'

This should go to ViaRewind Legacy Support's GitHub Issue Tracker, as this feature is not provided by ViaRewind itself but by this addon.