The World Endurance Championship has been using synthetic fuels since 2022 from TotalEnergies (https://competition.totalenergies.com/en/auto/endurance/wec/...), there's also Sustain (https://sustain-fuels.com/) in the UK as well who seem to be growing reasonably well but are a mix of sustainable & fossil fuels. There's some variability of how green they are, you still need to burn something so there's going to be emissions as well but they've been validated in the motorsport labs as being viable and they're starting to make their way to consumers.
Similar experience for me, I was active answering questions about Qt (and asking plenty as well) and got approached through to go work at a startup building 3D printers with bespoke software. Took it, had a great time, learnt a huge amount outside of my skillset and got to go do the CES experience.
Wow, just wow. A parent will go to any limit for their child but that was one of the most truly detailed descriptions I've ever heard of diagnosing a new genetic condition. Thank you for being willing to share it.
I genuinely hope you find a solution, will you keep updating on the progress?