The Vita has some good games, and it has built-in support for psp & ps1 games, which is not emulation IIRC. It can be a nice portable emulation machine, especially the Vita 1000 model, with the OLED display. The 2000 isn’t as nice due to the worse display.
If only moonlight could use the USB connection, like vitastick.
Do the triggers from bluetooth controllers work with moonlight? I don’t remember if you can normally connect controllers to the vita, but there’s this plugin that makes the vita think that it’s a pstv, which makes it support multiple gamepads.
I haven’t used moonlight on the vita, can you map touch input to L2/R2/L3/R3? The back touch-area would probalby be good for the triggers & L3/R3 aren’t used that often, so the touchscreen might work for that.