I have been playing the idea of no expander ball with separate neck expansion. For me, it would be best to use a tapered expander ball. That would be like Hornady and RCBS use currently.
I've got two Lee universal expanders. The NOE expanders would allow picking ID of the neck. I wonder if Lee mandrel sizers would also work very well if neck sizing. Might take a look at standard Lee dies. Those dies would get you there without an extra step. I've had RCBS send oversize expander balls for cast bullets.
Point being there are more than one way to deal with expanding bottle necks.
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