Parametric Secure-ish Temporary Deadbolt Plug

You are painting a door, perhaps, or for whatever reason can't put the lock back on your deadbolt before bed. This plug fills the hole and screws in place, without exposing any hardware to the outside, and can probably be ready in 30-60 min.

Is it secure? Maybe, although a perp might drill the plastic clear enough for a screwdriver, which can draw the bolt mechanism. (New) I added a pocket for a washer or coin to muddy the waters against drilling.

Security pointers:
1. Recess and fit the plug tight to the door cutout so that prying the edge is a hassle.
2. (New) Place an M3 washer into the anti-drill pocket (or resize it for a penny). Ideally a drill bit would catch on the washer's ID and spin freely, or if the perp gets aggressive they'll end up rendering your bolt inoperable when they over-drill through the washer. More likely the perp will just get confused after they thought they made it through your plastic but then they can't get their screwdriver to move the bolt. Rememb