Revert to Official

Hi everyone, I've got a Galaxy S5 on Fido Canada which recently got the marshmallow update, and I want to get the OTA update. I'm on stock ROM but rooted with busybox, xposed, link2sd, UPSM manager, MW manager and build.prop mods all without a custom recovery and I want to return my system status to official so I can get the OTA update. I know I can use Wanam xposed to set the status to official but I'm wondering if the update would screw up my phone due to my xposed version's incompatibility with marshmallow. Is it safe to use Wanam to get the update, will the new ROM remove xposed from my phone or will it brick my phone? I don't know how to remove link2sd's mountscripts, will they cause a problem in the update or will they automatically get deleted? my phone works good now but I want to know how to do it right before I touch anything. What is the best way to go about this? BTW I'm currently on kitkat