Atkins sells a kit for use in a standard press. That is what I use.
Please check everything for tolerances, you will thank yourself later.
Bearings are like $30.00 new (for 2) I think I would go that route, the chance of damaging them removing them is not entirely remote.
There should be a small ring around the metal part of the oil control ring that rides on the plate. I would expect this to be shiny (unless it rusted in the coolant).
If a seal is questionable, do yourself a favor and replace it. Better 1 seal than the whole rotor assembly.
How not to port exhaust (note many changes in taper angle and flow restrictions, early open and late close). Made 255 WHp at 10 psi.
Much prettier exhaust port (consistent, near ideal taper angle, no avoidable flow restrictions, stock open and close timing). Made 216 WHp at 0 psi.
