ill let you know about battery life, i did a bivert and its a lot of work! then peeling off and reinstalling the LCD layers! insane. The new generation kits for DMG-01 is to replace the first board with the screen with a board and an ips LCD screen like an older smart phone would have.
Heres the kits i ordered for the pockets
Retro Pixel IPS LCD for Game Boy Pocket — Retro Modding
Trim the case, install, and wire two power wires and good to go! IF the only issue with them is the screen, I have some parts around so it should work!