After some more playing with it - got it to work!
However, it’s a bit clunky. I find in my coverage tool the bins are out of order by default and requires a lot of clicking through to collect all comments. I think I prefer the multi cover point and the simplicity of the other solution. The workaround to the lack of ranges displayed with my original solution is to just generate a longer comment describing all of the bins, so it kinda works.
Thank you both for your help.