I have some local changes, which include a fix for above feature request, which I will file a PR for soon-ish. My solution to this would make the normal poppy yield less potent poppy buds. I have no ideas about chemicals, so I would just replace most mutated poppies with the non-mutated counterpart.
Awesome! I was gonna suggest, if not making the poppies a growable crop, then making the mutated poppy 100% a product of the triffids.
In the book triffids are harvested for their oils, so giving some of them high yield opioids wouldn’t be so far off. Could easily be a product made from the poison gland with some degree of chemistry skill.
As a small change I think you should go the other way- the normal poppy yields many buds (like other crops) to signify you planting several, but A LOT are required to turn them into proper heroine. Think roses and perfume or something. I think you may need several, but balance may be necessary.