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Firmware to be able to utalise DC relays 1 and 2
OpenEVSE Support
The OpenEVSE firmware is fully open and located here: https://github.com/OpenEVSE/open_evse
I do not see any reason why the firmware could not be updated to do what you suggust.
I have already tried using a push that was requested a few years ago but was not adopted but can't get it to work and my coding is limited.
OpenEVSE Support
A Pull request would not get integrated into the Master branch until is tested, stable and works for all configurations possible. This feature would require the ability to enable and disable, the sub-set of the community that has a three Phase Power, an EV that is compatible with Phase switching and is using Solar Divert is probibly pretty low.
The way you would need to work on this feature is create a new branch from Master. You and the community could modify and test the code as you see fit. When it is ready, you would request to have the code pulled into Master Branch and it would be reviewed.
Nick K
With the later versions using AC to switch the main relay could the firmware be updated to include alternative utilisation of the DC relays that don't appear to be used for much now. A typical example would be of switching additional relays for phase 2 and 3 of a 3 phase system. Some modern cars can now switch between single phase and 3 phase while charging. (Chargers such as the Zappi can now do this).