While looking into the FlexiStove, I came across this current stove from the UK:

Bushcraft FireDragon Multi-Fuel Cooker
https://www.amazon.com/dp/B01CJZWBPK

and this fuel:

BCB Adventure Fire Dragon Solid Fuel (6 x 27gm Tablets)
https://www.amazon.com/dp/B00R33ZI0Y

The fuel looks especially interesting as an alcohol-based replacement for Esbit tablets. It is more expensive (about $1.50 apiece), but that might be OK for occasional or emergency use.

The reviewers on Amazon seem to love it. Here's one that's typical: "These gel fuel tabs are awesome. Burn hotter, better as well as cleaner then the older trioxane, and hexamine tabs. Doesn't leave that heavy residue on my mess tins. Doesn't smell so toxic like the other fuels either."

Anyone here have first-knowledge about these?