You mean something like this?
This is the SFB mod I made to my GOSM, coincidentally, on the same quest for the taste of charcoal, etc, etc. It works, kinda sorta. The hole size would be a very limiting factor. I got away with it because the side vent on a GOSM is almost the same size as the vent on the SFB. The SFB mod really works for me in a capacity that didn't exist when I made the mod. To wit, Todd's introduction of the AMNS and
AMNPS (much later). I place the
AMNPS and AMNS in the SFB next to the vent leading to the GOSM. Yes, I can use the AMNS/
AMNPS in the smoke chamber of the GOSM, it's just handy to use the SFB. Using charcoal in the SFB for the "flavor" is a steep learning curve. The capacity of the SFB isn't really adequate for a long unattended hot smoke.
Todd and many of his beta testers use the MES and have come up with a very successful method of using the AMNS/
AMNPS in the MES. This might be a better route for you. The MES isn't exactly a cheap unit to make all the willie nillie mods I made to the GOSM. Charcoal flavor? I bought a Weber 22.5" One Touch Gold and you don't want to know all the supplementary equipment available to modify the Weber to make it a clone of the
WSM. But then I like to tinker and am not really satisified with something as is.....it's more of a case of: what would happen if I?
Good luck in your search to satisfaction though. If you're of a mind to, don't let me dissuade you from the search though. Your answer is out there somewhere.
~Dave