I don't see how EU261 compensation should factor into their DODAR
Diagnose - Suspected tail strike (possible structural damage, unable to pressurise, required to land at nearest suitable airport)
Options - Gather info on the best suitable airports based on Fuel>Perf>Weather>Distance>Company Facilities
Decide - Choose best airport based on above.
Action - Inform ATC and request diversion to selected airport, inform crew, pax and company time permitting.
Review....
That's how I would of done it anyway