Is there still no solution available for doing even basic load management with WARP Energy Manager 2.0 with non-WARP charging stations in the network? OCPP or ModBUS TCP or anything else?

It looks like a great solution for our building, but not being able to use third party chargers (even if the functionality were limited) is simply disqualifying.

OCPP is made for that. You either need to set up your own OCPP server or use an online service. Then you need to configure all chargers to use that.

However, you will not be able to use any of the Energy Manager’s advanced features, such as PV excess charging. In fact, you don’t need an Energy Manager at all if you have OCPP to control all chargers.

Edit: Actually, now that I think about it, you can give EVCC a try. It can do PV excess charging and can control chargers from many manufacturers.