I think the BSA model might be one way to look. They have well defined classes and criteria for just about everything they teach.

The NRA has a similar well defined set of classes. The NRA training model has the advantage of being usable either by volunteer instructors or for profit, and seems to work pretty well both ways.

The reality is that most "survival" schools don't seem to be real businesses. They seem mostly to be set up by guys who are barely hanging on financially with lots of PT instructors and not much in the way of facilities. I don't know that they can afford to come up with something more uniform, or that they would be willing to do so. Many seem like pretty serious control freaks. Getting a majority of them to agree on much of anything might not be that easy.

I forget who did it but there is some group that has setup some kind of web site to teach a set of bush craft skills. I looked at it and it looked like there could be a lot of cross over.

I am not real sure just what you want to certify either. Are you certifying that each member of the class has learned certain skills? or that the instructors are capable of teaching certain skills? Or that the instructors are actually teaching the skills and the students are learning them?