I wonder if a simpler model could be done. When donating plasma your blood is cycled through some machine that removes the plasma and then your red blood cells are pumped back into your body. It's about the same as donating blood as far as pain/invasiveness. While it would take some doing, it seems pumping your blood around a UV light source has GOT to be simpler than removing the plasma. Yes, you still have to make the machine, but intuitively it doesn't seem super complicated.