Okay, so that’s slightly different.
But it’s still possible without having to use Trebuchet.
Take a look at the Remove Element from Array plugin column. What you could do is first use a split text column to create an array from your joined list. Then use the plugin column to remove the signed-in users ID from the list, and convert the result back to a joined list. Then if the user taps the button to remove themselves, you use the modified joined list to replace the original.
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It looks like to work. I was on the way to find this solution but I forgot “convert the result back to a joined list”. Darren_Murphy you never give up ! Thanks!!! 
Darren,
You are excellent in explaining things… please continue by doing great things.
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