G900P safestrap?

Silly question perhaps, but my google-fu is failing me here.

Is there such a thing as safestrap for the G900P? I find references for ATT/Verizon builds everywhere but am attempting to determine if they will install without issue on the G900P... Would like to use the multi-boot option to experiment with some roms and tinker with things without needing to re-flash every change.

Thanks.

Any AOSP ROM's for g900p that don't have the theme engine?

Hello! I'm looking for an s5 ROM that doesn't have the theme engine in it.

Or, anyone else having issues with cm12.1 based ROMs being slow? Laggy? Buggy? I want to get something stable and fast. I may flash a very early version of 12.1 as when it first came out, before any of the features were integrated, I remember it being much faster. Thank you!

Unlocked g900p does not show missed calls- can't change voicemail number.

I have had my g900p unlocked and it works pretty well. Makes and receives calls, internet works pretty good, MMS messages work.
My only issues are I do not get any missed call notifications and I cannot find a way to change the number voicemail dials. I am also stuck on 3G but that's not a real biggie.
Is there another ROM that will help with this stuff? I am running stock 5.1 unrooted. Knox is not a worry with me :) I have no warranty.
Kthanks