Not sure that there is any benefit of running openpli 3 on a 800se its a big image leaves very little space for plugins etc.
But if your getting a new sim then buying the a8p makes sense .
I find it has Huge benefits compared to other none genuine images.its not such a big size either .once you clean install and get rid off all the plugins you do not want you have loads of space no problems at all i have 14 different plugins and still have plenty of space,I have no hesitations in recommending openpli 3.0