As a thought experiment, I sometimes I wonder whether a gambit for raising capital for FIRE through crowdfunding might just be a crazy enough idea to work. Just by sheer volume, crowdfunding sites get your case for donations in front of potentially millions of people. If, say 200,000 people actually contributed an amount between $0.25 and $5.00, you might gross ~$200-250k in donations from people fascinated by the concept. Not chump change, and could really accelerate the path to the finish line. Perhaps you write up a manifesto, much like Jacob from ERE does at the outset of his blog/book, and put it out to the community to see if it catches. As mentioned previously, it surprises me how willing people are to give money to people they don't know on the internet.
One would miss out on the skills-, character-, and discipline-building the long road to FIRE equips you with once you arrive, but at least the math might work out hypothetically. Also seems somewhat selfish, considering all of the genuine need that exists already.
(Not actually considering doing this, but kind of fun to bat around in my head).