Honestly, one of the fastest ways to become bitter and cynical is to be on the payroll of a non-profit and see how the sausage is made.

I would instead consider perhaps cutting your hours at your company, and using the extra time to volunteer as an SWE for the non-profit of your choice and donate your time.

You are likely to have far more freedom if you do that, and likely even with the pay cut from working part time, you will still make more than working directly for the non-profit. You will likely also end up happier and less cynical.