The funding is still important, but in case potential supporters don't want to give funds which they cannot monitor, they can be encouraged to advocate for the programme and use their skills. Many people have an experience or professional skill which to them is simple and easy to replicate elsewhere - but to you seems highly technical and very expensive to buy.
The concept of Philanthropic Trustee is more active than a normal charity trustee which receives proposals and reviews reports. These are more active in their participation and combine use of their skills and oversight with a 'for no personal reward' position to link the programme to larger organisations. They act as brokers, character references and an assurance of propriety.
Perhaps next time somebody asks for money from you, or who you are about to ask for funds, consider their skills and contacts that they could be prompted to bring to you.