It took me 2 days to bleed my clutch and had the same frustations.
After ensuring there was plenty of fluid in the reservoir, I pumped the handle many times and left it open overnight. The next day, the same routine but those accursed bubbles kept on coming. I tied the clutch lever down for the second night and pumped again the following morning when finally it started coming good. I don't know if it was a very narrow fluid line opening or anything else, but persistance played a major part.
Be patient, be prepared for a lot of pumping and you will be rewarded. Good luck.