Used sesame oil instead of soy sauce - can I rescue marinade?
You don't need to rescue the marinade, sesame oil isn't going to ruin it, just add more soy sauce to get the saltiness you need. Sesame oil isn't going to impart much flavor to the meat in the marinade However, if you plan to use the marinade as a sauce then keep in mind that


Sesame oil is not going to add much flavor to the meat while it is marinaded, however is will add a lot of flavor to the cooked result, perhaps too much
That much oil could make your end result a bit greasy in texture
Sesame oil has a low smoke point and will burn and produce off flavors if added to the bottom of a hot pan, I recommend adding it to liquid


I would suggest if you plan to use the marinade as a sauce just add a little bit of it and add soy separately to the dish to make up for it.