Good luck with the project. If you have time and inclination, post up a pictorial in the Making Hot Sauce thread. Love to see and hear how it works. This is probably one of those things that might require a few trial batches to get it right. Also, I know of a business that sell thickening agents of all sorts and they do a lot of blends. They may have a seaweed-based blend that would work. PM me if you want their contact info. They are US-based, not sure of their international support.