Well, since Pandora apparently has a Linux environment, seems like maybe you ought to be able to run a regular PC build emu of RAINE on it, no?
I'm amateur-intermediate at this stuff, I have RAINE on my PC currently, It's the one and only emu I have to use PC for currently, and if I could make that run on Pandora, I'd be in heaven since I prefer handheld versus PC gaming. I'm just not comfortable in a desk chair ding PC gaming.
I'm smart enough to have managed the Dingoo, and even installing Dingux...but definitely a little help would be appreciated. Once I get my Pandora, I'll go from there.
There WAS one game from RAINE which I do not think works on FBA...at least not on the Dongoo...tt hangs the Dingoo...DoDonPachi!! and one other I really liked...I'll have to look at my list again and edit this, because I do not remember the name of it. Not one I play often, but another awesome example of thousand-bullet hell.