I've spoken with Dommes about NDAs in the past when they have demanded personal information prior to meeting me (this is a hard limit for me and if it is a requirement, I just walk away).

In those discussions they have always brought up their willingness to sign one & it has always been about trying to make me feel better about turning over that information. Usually they have a template already because they "have done it before". To me that is pointless as trying to enforce & collect any remedy for violating the NDA would probably be worse than the disclosure itself.

Maybe look at some tyoe of written agreement or contract that lays out the commitments & responsibilities of both parties in the financial relationship rather than an NDA (which is only about disclosing certain information). It is still a written agreement between the two people that can have impact in a court case even if the idea of a "slave contract" itself isn't.

When I first read your post I thought it was a prank, but I was wrong. The reason I was confused is because you are not talking about an NDA, probably disclosure is your least worry, but about a contract.

I was in situations where I considered a contract too, and doing it could be a very good idea, not as much for reasons of enforcement against each other but for making the rules clear, and protecting them against the rest of the world.

It should not be difficult to find a good contract lawyer, from a legal point of view the BDSM part is not relevant.