Which methods really don't mix with BE?

You can try everything if your fundament is strong. The risk of ruining your chops is not really big.. Maybe you should ask yourself if it is effective or productive to do other methods as well. Mpc buzzing and free buzzing is IMO counterproductive or ineffective to say the least. Stamp pedals are not adding to the process. Gordon's. A-E-I theory is not really necessary anymore.Quinques extreme GGG setting of the tongue for the high register is too much, and I advise everybody to leave this thing alone (it took me years to get rid of this again). In fact, methods that say that compression is made by tongue arch or breath support (they often imply an open aperture to 'let the air do the work') are contrary to BE.

NB.

Always keep in mind that if something really works for you, just keep doing it, however strange or simple it may seem (or what somebody else may think of that, and that includes what I am saying right here). If your warm up feels good when buzzing the mpc that is great. If a tongue arch makes you play lip slurs earsier, do it!, etc. Some of those things might just be part of your mental preparation and thus confidence enhancing. Don't expect, though, that every exercise is equally effective and try to observe whether flexibility, tone, endurance and range is good or improving.