From the official reports mentioned elsewhere:

> From the effective date and time of this AD, do not operate the aeroplane, except that a single non-commercial ferry flight (up to three flight cycles) may be accomplished to return the aeroplane to a location where the expected corrective action(s) can be accomplished.

So they are allowed to be ferried in certain situations.

Yes. You’d have to seek an exemption from every country you’re overflying. Probably not worth it.

Typically not. Ferrying without paying customers is probably allowed.