I do have a face plate. Still slathered in cosmoline for some 17 years. Might be time to bust it out.If you have a face plate for the lathe you can use milling hold downs to hold it to that. Might be easier than the 4 jaw
I have arbors both with and without the lock pins. The the ones without work ok on smaller holes, but when you start cutting larger holes (probably 2" and up) I've had them strip the threads out of the hole saw because of the increased torque generated. Just food for thought.
Ted