When I owned a pilothouse ketch a few years ago one option I came accross was to have two pieces of timber made up slightly larger than the window and connect them together with four bolts & wingnuts in each corner thru the glass. Obviously this is an emergency system as it assumes the glass is broken, however it would be cheap & easy to have the parts onboard to make it. How hard this would be to install in weather rough enough to break windows would be an interesting question.
All the other systems I saw meant drilling holes and / or having bolts or L shape rails sticking out ready to catch you every time you walked past the window. Like Hellosailer said it's not rocket science.
Don't have any photos however if you look around marinas long enough you will see some examples. Look for really beefy looking yachts designed to sail in arctic / antarctic waters.