I'm no expert, but even if using a vacuum device, don't you still finish by bleeding the lines?
Here is what RJM says about bleeding the system.
Note On Bleeding Clutch System*
If you are attempting the pump/hold method of bleeding the hydraulic system with the RJM Pedal installed you must reduce the AFP setting to 0% restoring full stroke to the master cylinder in order to get full strokes and get all the air out. Failure to do so won’t allow proper bleeding of the clutch hydraulic system. If installing the RJM Pedal at the same time as a new Clutch, Master Cylinder, Concentric Slave Cylinder or Stainless Clutch Line it’s recommended to install and bleed the system first with the OEM pedal. Only install the RJM Pedal once everything has been bled completely and the new Clutch, Master Cylinder, Concentric Slave Cylinder or Stainless Clutch Line, etc are checked for proper operation.