You could use the following method
Use a hose fitting on the bleeder and leading to the brake fluid reservoir. Pump 10 times the brake lever and then hold pressed and loosen the bleeder. The lever stops at its end. Tighten the bleeder and start another cycle with ten times pumping the brake lever. Redo the whole procedure till the brake lever feels it has strong resistance. Keep an eye on the reservoir not to run out of fluid. Refill as needed.