If you want to use blazing pyrotheum in your magmatic dynamos, my suggestion would be to set up a blaze farm (MFR Auto-Spawner is a good way to spawn blazes) so you can get blaze powder and sulfur, both required to make pyrotheum dust. Run the blaze rods through a pulverizer and you get 4 blaze powder and a 50% chance of getting sulfur. Basically you can get unlimited blaze powder and sulfur so no more pulverizing coal and netherrack to get sulfur! Make coal dust from coal (macerate or pulverize) which you can get from uu matter or bees, and the same goes for redstone. I would recommend a cyclic assembler to craft the pyrotheum dust, then melt it in a magma crucible, and you got blazing pyrotheum! Sorry if this was too long or nerdy, but hope this helps!