Is there anyway you can set the charcoal basket higher? I have the option on my UDS to place a grate right above the charcoal basket for a diffuser or water pan. Also serves the purpose of elevating the basket to just bellow the cooking grates so I can hit grilling temps. That would certainly work for your situation if that option is available to you.
18" OTS, 22" OTG, SJ Silver, Cimarron Offset, Coleman Bullet, PBC, UDS, QMaster ATC