Multi user icon only possible on deodexed z2 port by gaurav for which your device already has this mod, impossible on stock 5.1. As for using the M2 system ui apk doubtful but you never know till you tryAny chance for working in t2 ultra..
And can u add multi user icon also..
For lockscreen, please upload a screenshot..Working in t2 but lockscreen clock is different looks odd and old once.
And ram icon edit icon are over lap.. On notification bar..