I'm ordering Craycort grates in a few days for my Performer and am thinking I'd like to put this on there as well. If no one confirms before then, I'll post.
turn the big one upside down. fill with charcoal. put paper under and light.
i also have an older smaller cheapy chimney that i use for small burns.
i can see the need for most, just not for me. yet.
I was seriously considering the purchase of the smaller chimney till I saw your ingenious idea! Gonna try that one real soon. Meh... I will probably still buy the little guy.