Installing on Goku GN405

I have a Flywoo Explorer LR which has the GN405 FC. I currently have a beta version of iNav on it but I would like to attempt Ardupilot.

I know it isn’t a listed target. From my research it is a STM32 chipset with 1MB flash.

What is the process like to try on an unlisted target? Is it as simple as trying a custom build or is there a lot more to it?

At this point I’m not happy with the iNav performance as it is severely glitchy so while I would prefer not to, I’m not that upset if I actually brick it because it isn’t flyable right now anyway. I figure if it isn’t extremely involved it may be a nice test run since the Explorer would be a good Ardupilot candidate.