I think offering them NFT wont make such a big impact and also it will be difficult to have that implemented on time. The best thing we can give is bringing awareness for their situation and that specific event.
Maybe they can team with a good and know photograph (if possible having photographers at ceremony) to take a good and powerful photo of the wedding. Photo that then could be auctioned by the DAO, on the same day so some press will talk about it. Profits could to Stella and the family, or to a related Assange cause. Maybe pay a % to the photographer aswell.
This could be a good way to celebrate and make the moment for eternity.
We just need to be careful donating to the family because of all the FUD. Maybe DAO treasury can keep a tinny % of the auction but not sure if that will be morally correct. Or the sale from the NFT could be to an outdoor or newspapers camping in the UK
We could also have a second photo that could be airdrop as an NFT for all the wallets that originally contributed and still have tokens
For example a photo like this
