If you want to remove the meter, as already mentioned, that is certainly possible. However, I am currently wondering who ultimately lives in the 2 residential units. Do you live there and in the second apartment a relative or someone unknown? And who pays for the general electricity? How is it divided?
Since general electricity is also variable, you could certainly install a private meter in the then free meter space. This way you would still have an overview of what is generally consumed.
Another advantage is certainly that it is easier to replace a meter than to remove a meter, disconnect the wiring at the terminal block, and transfer the fuse(s) of the general electricity to another meter.
One more note about finding an electrician.
I myself had a meter here that was ultimately no longer needed. It was removed without replacement. Beforehand, I contacted several companies about the costs with the note that only the meter needs to be dismantled and handed over to the responsible authority and nothing else in the system needs to be changed.
One wanted to take a look first and then give a binding, paid offer.
Another company wanted a flat rate of 200 € net without looking at the system beforehand.
In the end, I found a company where the boss himself came out (free of charge) and gave me a price of 50 €. The order was placed by handshake. When the invoice came, it was about 54 €.
Conclusion:
If you don’t just hire the first company, you can save quite a bit of money.
PS. The deregistration is done by the electrician, so you have nothing to do with it.