As far as i can understand OTG do not work yet on qcom devices in mainline, but i am not sure, my poco f1 does not have otg, neither my lavender, actually it seems that are only device-mode (peripheral-mode) capable, not host or dual role. Probably a bluetooth keyboard should do.OK, yeah OTG doesn't seem to work on my Oneplus 5t with POST MARKETS so I can't use keyboard or mouse with it. It's not very usable on that phone unless I somehow remote through my desktop some way. SSH or something maybe. At that point it would be a glorified small screen, maybe it could show stats of my PC somehow. I'm trying to find a way to make that phone useful, it feels like a waste having a good computer/phone that could be made useful somehow.
With the Pad 5 I'm stuck with MIUI for now altho I've rooted it, it would be fun to install an actually good Android on it. I'm not a big fan of MIUI, it's not awful but it could be better.
I've never run a GSI on it but are those bad or something? ROMs are so specific to the specific hardware so I bet we won't see much development for custom ROMs for this one unless I somehow learn how to port another Android ROM to it and I'm no programmer(But I want to learn). I'm very tech savvy, I daily drive Arch Linux but unless I follow a speicifc guide on building software I'm kinda out of luck atm. At least with my current level of technical knowledge.
Yeah, MIUI is not the OS that i like either, everywhere commercials, i paid for that device, was not free..... and that carousel is driving me crazy....
I don't know anything about those GSI images unfortunately, and probably will take a while for a lineageos to be available