[Q] Two questions about 5.0 ROMs topic

Hi,
I'm currently on stock 5.0 ROM (Simple ROM) but I prefer pure Android UI. I've got two questions:

1. Is there any fully-working and stable 5.0 ROM?


2. I'm on KK bootloader and TWRP 2.8.5.1 w/ Bump. Do I have to do anything if I want to flash non-LG 5.0 ROM?