My 2¢
0.5 degrees seems to be the consensus for tight tolerances with the angle cube.
I like the new arms, but I don’t know that you will attain any more precision with them than you are already are. My personal feeling
is that when the SWAT comes out, it will be a very nice addition. There is no longer a picture of it on the swat thread, but it is a way to maintain set angles despite varying stone thicknesses.
50/80 stones would speed reprofiling. Don’t really want to apex/create a burr at that abrasiveness, but rather get the bevel going in that direction.
I like the ceramics, depends what you are looking for edge wise. Many people, self included, like the bite left by either the 600 or 1k stones. Ceramics are more for polishing/refining. Won’t produce the mirroring that water stones (Choseras) will.
No simple answers when it comes to sharpening accessories.
BTW, welcome to the forum. Lots to read, consider, ponder, available on the forum and resources area of the site.