Google "headless macbook", there is a community of people making macbooks without displays.

The idea started from recovering macs with a broken display and using them like a mac mini. It's possible to find "broken macs" for cheap in second hand market and if the problem is only the display you can go for the headless approach and have macOS with Apple Silicon for very cheap.

Apple Silicon has outstanding battery life, without a screen I would think even more.