FWIW. I started quality mining on Fulgora and realized this issue, and my solution is to add separate interrupt which checks if item count of uncommon scrap > 0 OR rare scrap > 0 OR ... and if so the target station is the normal "unload :scrap:" station. It's just one extra interrupt with 4 ORed ...

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The simplest approach: since I use these constant combinators as markers anyway, I set them to e.g. -1000 iron plate, and connect to belt. The belt sets to enable if everything is > 0 . Simple, no extra elements needed, easy to copy and paste. Contamination is rare so I ...