Its really a question of what you want, big hits, water use, group use? The options are so plentiful and varied its hard to list them all and do them justice.
However a good starting point.
https://www.ddavemods.com/store/p11/18mm_Vaporizer_Wand___3_Basket_Screens.html
Not all O-rings are equal and the rubber ones I know would be iffy for many vape uses. However I use a lot of high temperature silicone O-rings and have never melted any of them, I hope the guy on reddit gets his fixed.
You said the M irritates your throat so maybe a log is a good choice. In my case my log vape is easier to use then my brick but my flip brick hits harder.
Its often a social thing with uniform cops, aside from getting busted once in the 70s (really, really sucked) I have never eaten another charge in spite of getting caught holding a number of ti times. Not saying there aren't asshole cops there are asshats in most every group, you just have to...
Most of my getting chased stories are because the chaser thought I was a threat to a young one, an invader of territory or some other social transgression on my part. Aside from some barbwire cuts and electric fence jolts it was mostly about getting out of the way. The real threat and stories...
Laws and regulations are often written and enforced to cover the lowest common denominators, broadest of situations and for ease of processing, it sucks but that's life. If one chooses to avoid enforcement then don't be the common denominator, avoid the obviously sketchy situations and be ready...
I altered the grind and screen placement from the OTB suggestions but those changes have their own limitations. In the end I stuck an LSV heater cover on a Da Buddha and went from there.
I have a 12" beaker that I seldom use (wet or dry) with my Nano but I really enjoy using an 18" straight wall piece. The smaller volume and ease of clearing seem to be the biggest differences at play.
IMO grinders are like vapes, in that one needs to match the tool (vape or grinder) to the needs and preferences at hand. What grind and thus grinder that works best in a small load conduction vape is often not the same grind or grinder that will work best in a large capacity convection vape...