Maybe a 5 ml syringe with a 0.5mm or 0.6mm needle could be used in the beginning to give a very slow but steady flow. The tip of the needle would be in the emulsion kettle. After the first 5ml you could automatically move to bigger syringes and needles that give bigger flow rate with less accuracy. So you would divide the solution into several syringes, controlled by motors by computer. This would need quite a bit automation, though.