Good news!!! Check the GrabowskiDev github or his post in r/ psp , he's make a mod version of tempgba (gba emulator) for launch GBA roms from the PSP xmb menu!
I am interested in getting a Switch V1 BUT will the battery life be the same as using original games/original OS (approximately 3 hours max in handheld mode) or will the time be less?
and is it mandatory to create the partitions for sysnand /emunand? I would like to use the maximum size of my...
The only way would be editing the eboot of your emulators (putting the icon image and background of the game you want) so that each selection "icon" in the XMB is seen for different games BUT you would still have to load the game, probably the emulator has some path to load some rom...