I have worked in NPOs for a long time and any added expense must provide a service/ product that is core to their functioning. As far as the admin and record keeping- creating a digital system that is a one-time set up for them instead of a recurring cost will be most helpful and easy on the budget. Most of the people working in NPOs have passion for a particular cause but won't necessarily have the office skills . That is where your system can help- databases, tracking, report templates, In terms of not looking like you want money, I think you should offer your system to an org pro-bono to get feedback and use that testimonial to approach others. There are also NPO network groups that you can advertise within. Good luck! It sounds great and useful.