Further to my original question, we can't use tape any more - infection control didn't like it when it started to peel and look tatty.
So the latest version required a lot of time in my shed cutting plastic rods to length - see photos.
We are closing one hook on each machines drip pole to attach coloured rods with coloured padlocks and stainless steel cable. We need padlocks as we had an incident a couple of years ago with staff taking off tape and coloured sheets and using the machine on non-isolated patients without the techs de-isolating.