I only see Ilford and Fuji and Adox capable of releasing new stuff. Agfa dropped out a few years back and Kodak has to struggle to keep it's head up in the film business.
I would die to see a film with a 6 ISO speed (yeah keep dreaming).
An ISO 6 film is a snap to make. Anything in the range of 3 - 12 is easily made in the home darkroom with 4 ingredients, Silver Nitrate, Sodium Bromide, Potassium Iodide, and Photo Grade Gelatin. In addition, one would need a syringe and a stirring hot plate. It would take about 3 hours of time and produce an emulsion in the range you specify. Hand coating plates is also easy.
See other posts on the exact formula and the coating methods.