ellamac – I doubt you’d find anything applicable (enough) for your needs, but you have a couple of other choices here if other posters can’t assist with anything existing.
Whilst Owners can install some items such as safety screens without the prior consent of your Owners Corporation (O/C), if only for quality control it would in my opinion be preferable for your O/C to either consent to each individual Owner’s requests to install (safety) screens and handrails and similar items on Common Property by a Special Resolution taken at a General Meeting; that’s passed when at least 75% of those Owners present at the Meeting either personally or by proxy are in agreement, OR;
Your O/C can make the Special Resolution (above), and then use the wording of that to itself create and Register a simply worded generic Special By-Law to apply to all such installations as you have suggested, which can be written by anyone who’s not prone to legalese or verbose language (like me) using this Form and by paying the prescribed Fee of $102.00.
Hope this helps.
(Struggler’s post came in whilst I was typing mine, but they’re pretty-much complementary as usual)