Ok. Didnt know you already tried it, for me this would have been fine,
but you are right, there are always some people out there who will never read any manuals/tips (even if you give them a really huge warning sign in front of their face) in my job as a sysadmin i face these people, luckily this is not the majority ;-). But i think the situation like "it is now" is also not perfect, so why dont try it again, and let those that ignore all rules face the consequences,

I fully agree with ELISHEVA the information should be short, pregnant not more than 5 lines.

Maybe it could even be possible to remove the (unchanged) "template text" automatically for those who just post below it, or let it be there and let the community "solve the problem" (some might send personal messages for those that never listen) ;-)?
btw:
Personally i did not read through all the writeup tips, e.g.and it took me around 2 hours iirc before i got my first posts written, and formatted right (with links to other ids, read through all the tips on formatting, posting ...), that is too long, or maybe i am too silly and other new users do it in 5 min ....
I know this is a difficult task and there are always some drawbacks, no solution is perfect ...