[Q] VPN with pattern unlock rather than pin or password topic

Recently upgraded from the S4 to S5, and the only thing I'm disappointed about is not being able to set up VPN unless I set a pin or password as screen unlock.

On the S4 (unrooted) I was able to set pattern unlock, which I would like to do on the S5. Any ideas how I can do this without rooting? I only occasionally need VPN access so prefer not to root or have to use pin/password just for that.

Thanks!