I have worn 3 rings in my life. The first one broke; it was made of coconut. The second one, I lost it. The third one was uncomfortable.
None of those prejudiced my blood flow. Now, I’m obviously not saying that no ring will do this, but that we would only need to pick a proper one. The second ring I mentioned was roughly 5mm wide, which is enough space to write LessWrong on it.
I’m sorry it took me so long to look at this. That’s not what I had in mind, but I’ll show you as soon as I can.