I'm not familiar with the system on your car, so my advice may be incorrect...

On the models, like my '66, with the master cylinder located just behind/above the clutch pedal, there was a trick where you ran a clear PVC hose from the left front brake caliper bleeder screw (on a left hand drive car), over to the bleeder screw on the clutch slave.

You filled the brake master reservoir, cracked the bleeder on the caliper, pushed the brake pedal down until the clear PVC hose was full of fluid, attached it to the bleeder on the slave, cracked open the bleeder on the slave, and then continued pumping the brake pedal to reverse bleed the clutch system. It's a bit fiddly, but works.

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