"I would like to have a through ticket on Wizz for protection in your scenario but think it's separate tickets."
Again there is no think about, it will be separate unconnected tickets.
Until recently I lived in Abu Dhabi and used AUH regularly and prior to that used it frequently as a transit point. A quick glance at the arrival and departure boards when passing through tells me how poor Wizz Air are for cancellations and keeping to time table, not the media although I have I have read various media articles on their poor performance. That is without the issues of moving operations to the new Midfield terminal. That said, I however suspect AUH will be the least of your problems.
"Wonder what they'd do for me about a cancellation."
Read their T&Cs.
You will get the option of a refund or to rebook the cancelled fight for a later one, but for that flight only, they are not responsible for any consequential loss being a point to point airline. For the other flights you simply become a no show and your ticket(s) cancelled with no redress.
You appear to be determined to go through with this and therefore there is nothing more really to be said, other than I wish the best of British and yes do report back.