aromatherapy dish....I am a barbarian so I never used one.
what's a good amount of spare tubing to keep on hand...Your right it is about use and maintenance, I have been using the same silicone tubing for over a year and a half but I clean the tubing daily.
Is spare glass recommended?...Oh baby, I am a big time serial glass killer so I have at least one backup of every glass piece I use (heater covers, water adapters, stems bubblers, etc) but most folks get by with far less.
Water pipe adapter?...You bet, look at an 18.8mm male to male adapter is a must have piece, two are better as it can fill the bill of the wand as well as a connector to the glass piece.
Ceramic disc worth It?...Don't use them so no real opinion.
How many screens does a person need?...Keep them clean and don't take them out of the glass and the stainless ones will last for years. However brass screens get replaced a couple times a year on a daily drive Da Buddha.
I'm thinking along the lines of making sure the SSV works, and anything that might make it fun again....Look at the DDave mods (
https://www.ddavemods.com/store/c3/7th_Floor_Vaporizer_Mods.html), they make a number of adapters, screens and wands for 7th desktops so there is a lot of interchangeability between kits. The parts are very good for load reduction as well as general use.
Don't worry about asking too many questions, responders on the board are glad to help. Good Luck, hope to talk at you later.