@jmeyendorff - I came up with this solution for another community member -> Multiple pumps one controller?
This same process could be used to just pair the zones that need a pump relay with the pump relay at a cost of ~$6.00 per zone that needs to work with the pump relay.
As far as a software solution - I have no idea what will be in V3 or when that version will be released, nor do I think that Rachio will comment (they haven’t been) on either topic.