Esbit tabs can't be lit with a firesteel, unless you grind (produce a powder) some of the tab up first (here's a video about how to do that: https://www.youtube.com/watch?v=gHRmWVitRyE). A firesteel is much safer than matches or a lighter in my opinion, as it can hardly (if ever) fail, so I'd prefer a system that allows a firesteel to be used.
So, I am considering grinding the tabs before leaving home, and to store the Esbit it in a suitable strong and tightly closed bottle.
If this would work, It would also have the advantage of being able to dose the amount of fuel you want to use.
But, I don't know how effective may that be in real use. What I feel is, a ground Esbit could be very problematic in case of wind, if you don't protect it properly, a strong gust of wind could blow the dust away. But assuming that there's no wind or you properly sheltered the fuel from the wind:
Is a ground Esbit as effective in producing heat as the intact, un-ground, tabs? Or, if there is a difference, how significant is that?