They are a little costly, but there are degreasing machines/systems on the market for this kind of thing. In your situation I would highly recommend one. Or two if you have that much demand. If you do not want to go that route, think about using a coolant/lubricant other than oil. There are options out there. Finally, you might want to consider a career change. It is doubtful you will be able to change your company's current policies. Find one that is already aware of health risks and already takes steps to reduce them.