Hey Keith,
A while ago, I spent hours scratching my head to find a way to ignite rockets remotely (for the Opel Rak).
Found loads of systems on the tinternet, but they were or expensive, or over the top (and expensive
).
And I saw the light one day on my workbench... Simply use an old esc!
The ones for brushed motors.
Simple!
For Estes rockets, the igniter works on 9 volts (on top of my head).
Esc, lipo battery for power, plugged on the igniter.
Command is on a switch on the radio... Et voila
Flick the switch, send the current, and ignite
Then watch your pride and joy burn
I don't know how your ignite, but might be a lead.