Hello there and welcome!
Some of those ideas are actually what I also had in mind. If you’re really serious about making actual functioning equipment then I would suggest checking out YouTube tutorials or the Ghostbusters Discord.
I have actually posted the links to those videos that may help implement functionality to those Ghostbusters props in the Ghostbusters Discord.
My thought was to handcraft an emf detector with a PKE meter aesthetic. The Paragoggles utilize a nightvision by using inferred leds which can be found in tv remotes. I wish you the best of luck and I hope to see more of your work.