I agree that PoP is meta-defining and should be nerfed, but an ICD would be the most lazy and boring way to do it.
A major problem with the trait, besides simply being overpowered, is that it takes almost zero thought from the scrapper to utilise. No need to even know which condi converts to which boon, just see that people have condis and let your cleanses go brrrr like you would anyway without the trait. Boring. An ICD would not fix this, since it would practically never be worth it to hold off on cleanses just to get a favourable ICD timing on just a single conversion. Unfortunately it's one of the only ways the trait can be changed outside of a game-wide patch, which is why it was such a let down not to see a rework with this last patch.
There are many ways it could be reworked. One which sticks close to the current implementation would be to make it only work on some cleanse abilities. For example (could be other skills) sticking with the theme of alchemy, make it only work on elixir gun skills that cleanse. That way, it would no longer be best to have a set 'rotation' of cleanse skills, but instead to sometimes switch up the order to make sure the conversions on fumigate hit at a pivotal moment in the fight.