I got my remote start working!! 2022 Rebel EcoDiesel with NO HOOD LATCH switch. I had to do the same as everyone else did (Alfa OBD, SGM cable, new remote start key fobs programmed by dealer...). In addition because I didn't have the factory hood latch switch I had to do 2 extra things.
1) I added my own hood switch and wired it to connector C1, Pin 11 on the BCM. I found this by looking at the install instructions for the MOPAR remote start kit. There is a link to download the install instructions at the bottom of this page. It shows the BCM and the connector and wire to use.
MOPAR remote start install
I cut the wire going to the pin and connected one side of the switch to the wire (Pin 11) and the other side of the switch to ground.
2) I had to "enable" the switch with Alfa OBD. The setting was CBC CONFIG I/O: CONNECTOR A PIN11: HOOD AJAR SWITCH INPUT PRESENT set to YES.
That was it! I was terrified to cut the wire going to the BCM but it seems to work well for me. Try this at your own risk. It is working for me but no warranties.
As a bonus my remote tailgate drop also works. I didn't have to do anything for that, the new fobs being programmed was all that was needed.