As I said before, it’s a good idea. I don’t see a problem with crumbs except when you use it on toast, and you get that problem anyway with butter in a butter dish, or just using butter in the wrapper it came in, and seeing as no-one lets that put them off buying butter in these forms, it won’t put them off buying it in token’s pritt-stick-like applicator.
You stay with that idea m8. I reckon it’s practical and novel.