I made this build of /e/OS based on Android 12, if someone still wants to use an older version, but based on the latest version of /e/OS, here you go
https://github.com/gabrl12345678900/-e-OS-S-for-FP3/releases/tag/05%2F10%2F2024
I don’t know if it will work with FP3+ (Probably it will) But if you want to try, it’s at your risk
To flash this OS you need to use the latest FPOS based on Android 13, flash the recovery that’s on every release, adn then flash with ADB Sideload the OS.
To flash the recovery you have to flash it with command: “fastboot flash boot file.img”
replace “file.img” with the .img file you downloaded from github
Good luck 
P.s: I’ll try to make them monthly, but i can’t promise it because of school things