I learned pretty quickly when I struck out as an entrepreneur that a narrow audience is exponentially easier to succeed with than trying to generalize. It does seem this is rather tailor made for lawyerly document writing, and that is a perfectly suitable niche to target with particular circumstances that could be quite favorable for developing a sales pitch—their time is worth quite a lot of money, and their need to ensure that they have done everything exactly right is mission critical. I wholeheartedly agree with the above comment that positioning this as something like “document authoring for lawyers” would be a smart way to get established in a potentially lucrative market.