That could take a long long time. And it would disturb others ability to enjoy the painting. Show some compassion and just have their cut hands cut off and leave them in place until they drop off on their own accord. This will prevent this sort of mischief and teach these scofflaws about consequences (which they did NOT learn here). They have their notoriety which will only embolden them and others.
I can’t recall which factory this was, I want to say Germany. A couple of environuts glued themselves to the floor in protest. Everyone walked around them and ignored them for THREE DAYS. No water. No nothing. Finally, when they were begging the staff had someone come in and unglue them.
As an aside, making yourself helpless and dependent on the good will of others is probably the stupidest thing anyone could ever do. I’m reminded of the best line in “Zoro The Gay Blade,” spoken by The Evil Alcalde. “I have always depended on others being nicer than me, and I have NEVER been disappointed!”