Can't rotate Openbor on Raspberry Pi 4

[cscribn]

Pi Model: Compute Module 4 Lite (Wireless) 2GB RAM, Retroflag GPi Case, GPiMate Plus for CM4 Lite
Power Supply used: Retroflag GPi Case power supply
RetroPie Version Used: 4.7.1
Built From: on top of Raspberry Pi Buster Lite
USB Devices connected: N/A
Controller used: N/A
Error messages received: N/A
Verbose log (if relevant): N/A
Guide used: N/A
File: /home/pi/RetroPie/roms/ports/openbor/He-Man.pak
Emulator: openbor-v6510-RPi4 (https://github.com/crcerror/OpenBOR-63xx-RetroPie-openbeta)
Attachment of config files:
How to replicate the problem:

It's my understanding that display_rotate cannot be used in /boot/config.txt in order to rotate the screen on an rpi4. Instead emulationstation, retroarch, the console, and standalone emulators must be rotated on their own (https://github.com/martinx72/GPiMatePlusHowTo). I'm able to successfully rotate everything mentioned, as well as PPSSPP. But I have yet to find a way to rotate Openbor games. I did open a Github issue (https://github.com/crcerror/OpenBOR-Raspberry/issues/1), but there has yet to be a response. Any help would be greatly appreciated. He-Man, and the rest of the Masters of the Universe, would like to grace the screen of my Retroflag GPi, rotated properly :).