Yes it is supposed to soon be impossible to get wood (don’t laugh we don’t have that euphemism in Britain) that is not certificated. Boat builders have had the timber problem for longer than house – or decking – builders so I respectfully suggest you contact the nearest traditional nautical types and see if you can tap their source (there may be more than one specie available) – after all, a deck is a deck and importing two lots in one go could be more economical.
Might large firms in an area, who will want to buy wood over a period, join together to buy and control a sustainable forest somewhere on a charitable trust basis? It might stop it being turned into toilet tissue, palm oil or biofuel. It may also be great for tax purposes and continuity of supply.
Luv n Lite
Les Ballard