The topics you’ve listed will create a tech niche blog(not too broad), but it will not create a micro niche site. Micro niche site only focus on one topic. So you can’t use here Exact Match Domain name, like chromebooknews or nextnotebook dot com, you may even face trademark issue as well if you include notebook or chromebook in domain name.
Regarding suggestion, I would say ping your any college friends, who have creative knowledge about naming. There are always some Facebook and College friends who always give good suggestion on any college event. So you should ping them.
I have often see this kind of question on many forums, but in most of time, the OP don’t get any suggestion, because thinking about some names, take some time, which generally people avoid it. So the best suggestion is ask your friends/family/yourself. I probably go with myself, so later I don’t blame anyone, because whenever you blame to someone or in future you don’t like your domain name, then you will lose your productivity.