My approach would be to restore the habitat as well as possible (which will take time, obviously), and then wait for one of two things to happen - either future generations with more advanced technology being able to "bring back" the IBWO, or a population of an extant species (e.g. Pileated Woodpecker) evolving to fill the niche.
I worked at one of the most famous museums in the USA and handled various extinct skins and other ones that needed attention. Arsenic was used liberally on skins. It is known to damage or denature DNA and other organic material other organic material .
I imagine there must be some recoverable DNA somewhere though with all these skins and of course there's always still a chance of netting a live bird.
Another bizarre thing about the luneau video that is difficult for skeptics to convincingly explain is the presence of a correctly sized bird on a tree within feet of the tree where the flight sequence starts.
It's beyond a billion in one shot if the bird is a pileated to have a bird with a large white lower wing saddle, 20 inch tall on a tree before a sequence comes out with a bird that looks more like an ivy build and not like pileated.
I'll give anyone $50,000 usd if they can get any blurry video that looks like the Lanai video and is not an ivory bill. That's a fair offer it'll pay for a lot of years of kayak rental and you all like the bird anyway I assume. Great..,.. it's all settled then.!!