Lock screen that allows long PINs?

[ObiWanYJ]

I'm running a custom 6.0.1 AOSP-based ROM on my older phone. The lock screen that comes with this ROM (MoKee) has issues, so I'd like to find a different lock screen app to use. The problem I'm running into is that I use a long PIN for my lock screen password, yet every single lock screen app I've tried (and I tried about a dozen of them) requires that PINs be EXACTLY four digits. No more, no less. Even the apps that bill themselves as being especially secure still have this surprising limitation. Every stock lock screen I've ever seen has allowed PINs of varying lengths, so I'm bewildered as to why none of the aftermarket lock screens allow this.

Can anybody recommend a 6.0.1 lock screen app that allows long PINs? Bonus points if it allows me to have a camera app widget and set a separate wallpaper for the lock screen.