Even something as simple as a cheap cookie sheet set at an angle blocking the direct heat can help a ton. I did that before I got my Horizon convection plate for my OKJ and it helped even out temps so the firebox side wasn't scorching hot.
However, that hot side without a deflector makes some killer chicken.
Yoder Smokers YS1500, Kamado Joe BigJoe & Joe Jr., Weber: 18.5" OT(L), SJG(AU) & (DI) - Past Cookers: Yoder Smokers YS640 Comp Cart, Kamado Joe Classic, OKJoe's Longhorn, UDS, Weber: Performer(AA), Genesis Gold C(DH), 22.5" OTG(DI), 22.5" OT(L)
IMBAS Certified MOINK Baller