You name three organizations who did the exact thing you are looking to do. Have you reached out to the relevant person (it's almost certain that 1 or 2 people at each of these orgs knew how to raise money) at each org to understand in detail how they did it?

There are tricks to this kind of stuff, and some people know the tricks. I guess the first step is knowing that it's a real skill, that people know how to do it well and you need to learn from them. I suspect they'd be willing to share them given the circumstances.