If you're using acid cored flux, make sure any residue is completely washed off after you've soldered the joint, otherwise when you come to fire your igniter you may well find the thin wire has been eaten through
I've wondered in the past whether the following might be possible :-
Wrap wire round PCB as usual
Protect the bit of nichrome that's going to do the igniting with a thin layer of varnish (preferably something that won't impede the ignition, or strip the varnish later with a solvent).
Dip the whole lot in a copper plating bath for a few seconds to plate the exposed nichrome.
Solder normally.
Might not be worth the effort though.
This is done in the industry as well! I´ve got an patent pdf where such a method is described!
