Scope: The scope of this project is to repeatably light several fireworks simultaneously (Mandalorian Whistling Birds Vambrace build). This requires that the only action required to light more firework rockets would be to load them into the device. I have looked into the ways people have done this in the past but all the options I've seen are consumable or one time use. I've built a proof of concept design and now I'd like to improve it. My initial prototype uses the nichrome ribbon I removed from a car cigarette lighter coil. I chose to start with this since it was a cheap source that uses 12V. The fuses of the fireworks rest on the coil and as I apply 12V to the coil it heats up and they ignite.
The issue I am facing is that the coil takes awhile to heat up (no calculations in first design for efficiency) so I would like to design one that heats up faster and has more surface area coverage. I would still like to use my 12V LiPo battery. I can do the equations to figure out voltage, length of wire, amps, and produced heat but what I'm having trouble with is figuring out how to suspend the coil, ensure it maintains its shape, and doesn't short to the metal chamber it's nested in. I plan to use 28-30 gage nichrome wire which is not very rigid. I'm also dealing with a small space of less than a 2" diameter tube. Any ideas?
Thank you in advance for any suggestions you may have.
Edit: Thanks everyone who answered and provided suggestions! From your responses I have learned that mica, alumina ceramic, or other ceramic compositions will work well as an insulating material. Also, the use of thin stainless steel sheet may work well as the heated element for ignition.