Q_FRAME_TYPE for reversed motor directions

I have a quad-motor tailsitter, but I need to configure the motor directions to be reversed from the normal “X” configuration.

Some sources mention Q_FRAME_TYPE = 6 (Reverse X) as the right solution, but neither Mission Planner nor QGC recognize this as a valid entry. It is listed as a valid option here, but is not listed here. When I attempted flight with this param, it oscillated violently at takeoff.

Does “Reverse X” actually exist? If not, what settings should I use for reversed motors?

IIRC that is the H frame.