how about using one of those sigaret looking/sized lighters and saw the end off it to make a "sparlite" or just remove the upper part that covers the striker weel, it's already quite small...
Isn't what you discrive basically almost the same as the ranger rick "sparklite", that one has the push botom removed 2.

what do you use for container do you use for your micro kit ? i used a old model BCB matchless fire starting kit tin ( the older model one ), but that kit is now strapped to mine knife with some other things to creat mine "knife kit":