Offer a write up/video (concrete deliverable) for a fixed price to compensate you for your time and expertise with a money back guarantee if it can’t be replica

Offer a write up/video (concrete deliverable) for a fixed price to compensate you for your time and expertise with a money back guarantee if it can’t be replicated and sign an NDA to not disclose to anyone else for several years. Ask for the $ you want and accept anything reasonable. Sign an NDA first to establish trust - make it clear you have no ill intentions