Spread this information to any sushi chefs you know. The opportunity to help sustainable fisheries by eating puple urchins into obscurity is huge. It's what our economic system is best at.
Fugu isn't exactly easy to process for eating, but people are willing to pay a LOT of money for the privilege of eating it.
All you need is the right marketing, and purple urchins will be like hen's teeth within 10 years.