I've only done clutch slave cylinder on a Morris Marina when dinosaurs (though not many Morris Marina's) roamed the earth. Can't remember having a problem, but memory is hazy.

I'd suggest getting an enema syringe and cycling fluid through the system. Since you can both suck and blow, and can generate quite a lot of pressure, this is effective at clearing bubbles, doesn't use a lot of fluid, and is MUCH cheaper than the commercial pressure and vacuum bleeding systems ,

I have only used this on a (nonABS) brake system , so there could be unknown gotchas with a clutch, though I can't think of any.