I'm in a similar position, charcoal burning might be the best thing to do. Something that I'm paying more and more attention to lately is drowning under the influence of drugs or alcohol. I think it is a rather underrated method. It's easily accessible, guaranteed death if you make sure you're not found for a few hours (which shouldn't be problematic if you do it at a random lake preferably at nicht) and it won't take more than 2 minutes for you to pass out. However these 2 minutes will probably be very stressful if you're not drugged enough and even then probably (stressful and panicful but not painful). Another good aspect is that you won't be able to chicken out as you could when you're trying an OD or charcoal burning. My plan is to attach a really heavy object to my body (like a 200kg barbell or a Car) and just throw it into a lake that's deep enough. Body will be in a good condition when found too and even if you somehow failed and were to be found there is a much lower risk severe damages than for example when jumping/hanging/shooting fails.This currently is my favorite option.