In regards to the battery, I have it on good authority that the kick sensors when blocked will drain the battery - This is caused by dirt or more likely snow,The biggest theory, at least here in Canada is either the DCM is continually searching for a cellular connection to the Toyota satellite, or that ice and snow, or possibly mud on the kick sensors prevents the sensors from turning off.
My battery died 15 times in December and January, but when I made an effort to wipe the ice and snow off the sensors on the rocker panels, battery stopped dying.
Disabling the DCM could work but be fore-warned, this will disable the hands free microphone.
I was at my Canadian dealer last week, and there is no word on a kick sensor fix.
There is a DCM fix in the USA but not in Canada for the 2022 Sienna. Although Rav4 and Highlanders got a DCM fix for 2022 in addition to the Camry.