Cool idea, but if I owned a Pebble and wanted to do this, I'd probably just create a Tasker profile to accomplish the same thing rather than install another app.
The closest thing I could find was a Tasker add-on that was given root permissions and disabled the password, unlocked, and re-enabled the password. At least, that's where my research led me, I could never get that to work.
The Secure Settings is being transitioned to something they called System+ right now, so YMMV.
As well, Gestice keeps your screen locked with a PIN in addition to the synced-gesture unlock. This wasn't an easy engineering task -- it took a lot of persistence with with the Android APIs. (The only string attached is that Gestice has to be given a PIN for your lock screen, which it manages for you.)