Staying registered for a couple of months is no option. Maybe I register for the duration the process needs, but first I look for other possibilities ☺️
When I'm in germany I rent an Airbnb. As I read it's not enough for the embassy, they want an official registration. In my bank account is actually just a postal address from a friend. I can change it back to my old address, but I'm not sure if it will be enough.
You even pay taxes in germany when you just have an apartment where you could live in, even if your not there. So when I officially register I have to deal with several offices-tax office, health insurance, school office (I have 3 children). It means a lot of work and communication which I like to avoid ☺️