Should I make flickering flame for my offline demon machine sorc?

Gear is Demon machine with 15ais 25ar jewel. Razortail. Magefists. Ravenfrost. Soj. Vipermagi. Aldur's boots. Rising sun / telling of beads. Peasants crown. I have 1 shako and 1 maras but they are on my main MF sorc and I prefer not to gear swap. Edit: I also have 2 Andy's, I guess I could use that too...

I'm not rich in runes but I've got a vex. I was also considering making a hoto or possibly a death, and I'm sitting on a great base for an exile(need ohm).

I was planning on making a FB/ meteor sorc too, so it could be duel service.

I don't have infinity yet, either, so I don't know how good FF is w/o it. Is it worth the investment or should I hold off and use a different helm.