Thanks everyone for the input!
I will get a buck-converter for the final setup. In the meantime, I'll just use the usb to power the Nano during prototyping. There are still some functions that I would like to integrate into the script. Sleeping the Nano and smooth incremental movement with the remote. Seems like I'll have some time for it coming weeks, since the Dutch Government has announced a Corona lock-down...
I also consider starting a small blog on the project for the ones interested. But I get that this is not the place for that kind of post.
Bye for now!
Kasper