SAW Talking Shop

I am attempting to make my first Wig Stand , I am not certain what to finish the top with. Please could anyone give me some advice.

I've turned the above so far on a faceplate. I was planing to then mount it on an expanding jaw on my Vicmarc 100 chuck using the hollowed rings on the underside. The largest hole is 93mm diameter / 7mm deep but not dovetailed. The second inner ring is 74mm diam / 18mm deep. There is a 22mm hole drilled right through. I only have a 47mm jaw! It is gnarly oak so I need some grip. I could buy a 72mm jaw (at a cost) but the hole is still not dovetailed (It is essentially reverse dovetaield to grip a lid which currenlty fits very nicely!). I'm looking for better and cheaper suggestions.

I could lighlty grip it on my 47mm jaw and turn a tenon and then part that off when finished (it will shorten the end result)?

Any ideas welcome

The club has been approached with the offer of various polishing materials (there also stains and waxes not included in the photo). Asking £18 but may negotiate.

They are locarted in Clun. If interested contact Eleanor Smith ele@elandjsmith.plus.com