I recently quite my day job to be a consultant/freelancer in order to do similar things to what you describe. I spend the majority of my time working for clien

I recently quite my day job to be a consultant/freelancer in order to do similar things to what you describe. I spend the majority of my time working for clients, still, but I get to charge a lot more than as an employee, which means if I keep the same lifestyle, I can support weeks without any work - or in this case, working on my own startup ideas. It's not technically a 'startup', because I don't want to take the plunge and go all-or-nothing, but being freelance definitely gives me a -lot- more flexibility to work on my own project. This might be a good solution for you in the interim until you can jump straight into another full-time business venture?