VTOL JRM-V50 FC support and configuration

Hi,
in the last years I build some copter, wings ans VTOL’s with ardupilot. These were all standard-configurations. Now I want to build the JRM-V50 from Aerojtp.com. The problem is that the designers give you a setup for INAV, but not for Arduplane. But I love ardupilot and want to stay with this. Here is a Picture of the configuration:

The two Motors in the middle (1) are EDF’s that help the other 4 motors during hoverflight with lift force (in the INAV-Setup they are connected to one and the same Motor-Output and they are tilt by a single servo) . During transition they tilt forward to push the plane while the other 4 Motors stop.
So, simplified, it is a Quadplane with a single Tilt-Motor for Hover- and Plane-Flight.
I read the VTOL documantation again and again, but I do not find a sloution for this setup. It does not meet the standard Frame-classes, Frame-Types or Tilt-Mask that are shown in the documantation.
Please, can anyone give me a advice to find my way?

Thanks
Andreas