@Julianft please don't take it personally, I understand that it's impossible to create this idea & white-paper within few months. I'm just trying to understand what type of work you ask for backpay. If it's a couple of months of discussion of Protocol Specification and White-paper preparing for this grant application — I have a question why it should be backpaid?
It's a minimum required things to convince the community to "invest" grant pool funds into your project. Once anyone develop an idea to get funding, he usually ask funding for realisation of the idea, not for the preparing it's presentation.