I am quite sure the real challenge with any cassette "chemicals" is to provide the ability to store urine and defecation products over time.
With wild camping that can be a requirement, but as any site has to provide loo emptying facilities, elsewhere it is not an "essential" camping requirement, simply empty quite promptly, say daily.
Scents can mask natural fresh defection product smells, and dyes bias the colour if either are personal issues, but unfortunately allow anerobic decomposition, then thing can quickly become overwhelming requiring some powerful, not environmentally nice intervention.
Empty quite frequently then there is no great ask for any serious chemical intervention.
The bio laundry products by their very purpose use enzymes to break down organic substances, in itself a useful process at least to initiate even in short term storage of what products our loos store.