Originally Posted by gagan.u20
For the first app, i.e. Lockscreen setting, I've already made an app named "LockScreen Style". It does the same job what you wanted.
Just see my signature for the download link.
For the second app, i.e. Advance APK Installer, yes I can try to build it but right now I am out of city for 20-25 days and I left my laptop at my home.
So when I come back, I'll try to build this app.
For the third app, i.e. Timescape Small App, I think there is already a small app, you should search it on Play Store.
I saw your LockScreen Style app before but it switch between aosp lock screen and uxpnxtlockscreen. on my idea you can also switch between different uxpnxtlockscreen without need to change it on system/app.
you can try to resign your uxpnxtlockscreen.apk then remove it from system/app and install the resigned uxpnxtlockscreen.apk like normal app so there's no need to reboot.
Note: for the advanced apk installer I took the idea from the packageinstaller.apk from your zelly cream ROM