If you have those two, hoisin, rice wine vinegar, soy and a bit of sesame oil, you can make anything.
Oh and the Nuc mon too!
Mmmm fish extract...
We use wheat free tamari (and not all tamari is wheat free so be careful).
When I go to a sushi joint without wheat free tamari I order Sriracha and mix it with the wasabi. You haven't had fresh sashimi until you've slathered it with that mix!
Went to a place once that had mixed the wasabi with the Sriracha in the plastic squeeze bottle ~ "they knew"!!!!!