PanelDUE works fine on a RADDS board, iirc the pins in the connector had to be rearranged to match the top 4 pins in AUX1. I had to solder pins to AUX1 as well.
Firmware 2.03 works fine so far 🙂

Send: M115 Recv: FIRMWARE_NAME: RepRapFirmware for RADDS FIRMWARE_VERSION: 2.03 ELECTRONICS: RADDS 1.5 FIRMWARE_DATE: 2019-06-13b2

There is a lot of sdcard juggling between the printer and pc when setting it up.