I would suggest contacting a local T-shirt printer in your area.
I did when the company I work for decided to screen print the graphics
on control panels for electrical equipment.  Not only were they able to
determine the size of the screen needed, they also were able to get the
ink at a reasonable price.  They also did all the developing of the
artwork for me and was for our purposes cost effective.  (We required
an extremely fine screen as we had very thin detail in our texts.)
They may also quote you a price on having them do that actual printing.

We had to use an air dry ink (Plastisol, I believe) that produced a fine
black finish.  (I have Regina disks and I know what you are probably
aiming for.)  The air dry inks are not fun to work with as they quickly
will clog a fine screen and can be difficult to clean from the mesh.
You really need a humidity temperature controlled area to do the air
dry inks.

Heat cure inks are also available but these, I am lead to believe, are
not suitable for sticking to metal, only to cloth.

Ted Konetski