I just measured the grate for the 22.5 Weber and it is 21.5". This leads me to believe the grate for the 26.75 " Weber will be around 25.75" which just might fit this particular drum.
Seems to me that there may be room for three of them with that much extra height? Looking at Desert Dweller's BDS, you could get 15 butts in there with three grates.
Jim - Another transplanted Texan
Former KCBS CBJ
Large and Medium Big Green Eggs , Black 18.5" WSM, Blue Weber Performer - Stainless, Green Weber OTG Kettle , Brinkmann SnP Pro, and a Stainless UDS. One retired Portable Kitchen grill.
Red Thermapen, Maverick ET-732, EdgePro Apex Sharpener.
Avatar is the original 1951 Weber Kettle