Adafruit.com had some 5’s in stock today, for those of you in the US. They sold out quickly but not instantly. I didn’t try to get one because I don’t have an immediate use for it. I have a 400 and those have been fairly easy to get for quite a long time. They are basically a 4B inside a keyboard. Their main shortcoming is no built-in pointing device.
Simplest is use /etc/hosts to set up names, if there are just a few.