Don't ask what they want but what the Islanders can offer...and it stops right there.
The Islanders have virtually nothing to offer any team in any trade. No prospects and no picks unless you're mortgaging the future for years and years.
If they plan to move Barzal back to Center it makes One Center expendable. That means Pageau (I Think His Best Days are behind him) could go in a deal along with a cheaper alternative D Man Like Salo plus a Mid round (3rd or 4th) Pick. That probably won't get it done though...