Transition from university teaching career to curricular assessment type jobs?
I suggest the following course of action when thinking about any non-standard career path:


Identify people who already have the job you would like to have. Get in touch with them, and ask them as many questions as you can think of (about their job, how they got it, etc.). If you can't find anybody, chances are that this job doesn't really exist in your area. For instance, I am not sure if my university employs anybody for "curricular assessment", although we have a few people who more or less work fulltime on program management and development (which may be close to what you have in mind).
Find out what qualifications these people have, and which qualifications they had before starting their job. It's well possible that you may need additional training before you can realistically apply for the job you are looking for (e.g., to become a program manager in my department, you typically want to be a mid-career academic with considerable pedagogical training and some publications in education-focused journals and conferences).
Let everybody and their dog know that you are interested in transitioning into such a position. One challenge with non-traditional career paths is that most people in your network may not even be aware that you might be interested in such a job if they happen to come across one. The only solution for this is to make sure that your entire network is aware that you are not looking for a standard faculty position.
Volunteer for every opportunity to take on a role in your department that comes close to what you want to do. Besides giving you valuable experience this will also help you become known as the person doing program development in your department (and, hopefully, beyond). If a suitable job opens up, you should be the first person that people are thinking about.


In a nutshell, it's really not all that different from how engineers transition into management positions in industry. First, you make sure that people know you are interested in a management position in the first place. Then you get the necessary training and take over more and more management tasks, until a suitable opportunity arises and you get asked to transition.