Your RBA 'section' can take any sort of coil that the mod will fire. You only need to build within the minimum and maximum. You can realistically forget the maximum... nobody should be wrapping 3.0+ ohm
coils.
If you look at the coil wrapping page (calculator) on the steam engine
coils website, you can start your search for the correct wires.
24awg Kanthal would be a good wire to start - not too low, not too high. A bit thick, but do-able.
I tend to use SS316 these days. I don't build low on single
coils.