You need to learn to draw proper schematics, my mind balks at trying to sort out what you posted though I think other users here might be able to decipher it a bit better.
Weather or not a capacitor discharing would work depends on a lot of things, through a relay probably not such a good idea as they don't like high currents, you'd be better off using osmething like an SCR instead which are often used for pulse discharges. That aside you need to determin the exact energy delivered to the electric match that will cause it to ignite, determine the entire serires resistance of all the wire involved and calculate out what kind of current pulse you'lll get if you dishcharge it. There's really a bit of real work to be done if you want to be able to use this reliably.
What is the optoisolator module you're using?