The 1st 20 lots in the auction this year will be sold by 'silent auction' at the auction table during the 1st two days (plus of course any advance bids)
If that works then yours could be added (or be one of those 20)
Auction often has the odd Museum Fund item in so no problem handling that.
Obviously you wouldnt have a full description even by the time the catalog goes to press, but if you would want to go ahead with it being part of the auction I would need to know by end Feb latest.