Why no net metering? Is the output too low to bother? I get net metering is not great for various reasons, but why 'discriminate' against what kind of setup it is?
Sounds reasonable. Here in NL, everyone must get a new smart meter that has a separate counter for delivering back to the grid. IIRC, the grid company replaced it free of cost, if done before some date.
The old ones (Ferraris meter?) just ran backwards, which is attractive of course. Our new meter has a P1 port which can integrate into eg. Home Assistant
And 600w is probably below the average usage anyway.