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Is the slave cylinder bleed nipple on the bottom of the cylinder?
If so, the air can't get out, it has a better chance with a vacuum brake fluid bleeding device, commonly used for flushing braking systems.
What component have you changed recently?
Yes, it is a poor design, nipple on the bottom, difficult to get the air out.
A brake fluid sucker at the slave pulling fluid continously will get the job done.
Alternatively, take the slave off, invert it on the flex line to get the nipple up, and gravity bleed the last of the air out. Then refit the slave. DO NOT OPERATE THE PEDAL WHILE THE SLAVE IS OFF.
How did you go with bleeding your clutch?
Does it allow gear selection now?
I hope my advice helped you.