I understand. I have actually since posting this switched to the official plugin, where the issue of the phone number being required is also present, but unlike here, it’s possible to checkout and send the order to packeta using a different country’s ZIP and phone number.
I tested this with Germany and it worked well.
It also has support for different shipping classes, the only thing that doesn’t seem to work all that well is selecting pickup points, but I am mostly in this for home delivery anyway.
Best regards!