Force the special characters on them, and problem solved
Heck default an un-removable character in the input box at both the start and the end, that cannot be removed. Go one step father and make it a random generated one, so their password requires a special character as the first symbol and the last. Give them a nice explanation note, and presto, done.
Make sure it regenerates two new ones when they change their passwords.
That would turn more people away than it would solve with 'hacking' problems.
Something you need to remember, is that FS is not something you would only play on your home PC. Like web based email clients it is often used in multiple locations. With this in mind, users will go for a password that can be remembered easily. If they are faced with a situation where they can not easily remember a password they need to remeber in the biological vault, then they will be less inclined to use it.
This approach is not user friendly. There's a lot of people who log in from time to time with mobile devices or while out of town etc where they don't have their existing kit with them. This is only going to frustrate people further, and encourage bad practice such as writing the password down on paper and keeping it with them.
Improvements could be made, but this is not the correct way to do it.
A more logical solution is to have a feature the cows implement where it tests strength when it is entered and any that are below a certain value are not permitted. This allows the user to create one that is more 'friendly' to the biological vault, as well as educating people on what a "secure" password is.