Tom, at CandCNC might advise which of his products are best suited to your build.
It's not a plan but to hold a manual torch on my CNC plasma table I used a tube that the torch nozzle fit snugly into.
The tube has 2 splits cut in it & is welded to the torch mount plate at the bottom of the Z axis.
A gear type hose clamp is tightened around the assembly to hold the torch firmly.
The attached picture shows the above.