You'd have to define fully functional--but you can do it with a screen, squeegee, ink, and wax paper (for a cut out stencil,) if you have someone to hold the screen steady while you print.
Photo emulsion adds a lot to your required stuff list, as well as multi-color printing...
It's true, catalyzed WB doesn't need heat--but it doesn't have the soft hand of a heat-cured WB ink.