It is generally recognised that coupling can be ameliorated by,
1. increased directional stability
2. reducing dihedral effect
3. minimising the inclination of the inertia axis at normal flight conditions
4. reducing undesirable aerodynamic coupling
5. limiting roll rate, roll duration, and angle of attack or load factor for performing roll manoeuvres
The typical high speed aircraft has some sort of roll performance limitation by flight restrictions or automatic control device to prevent reaching some critical condition from which recovery is impossible.
I can't think of any manoeuvre on an aircraft such as this where coupling could be an issue, and assume modern flight control computer systems would look after point (5). They won't be doing twinkle rolls. With Airbus part of the team, whatever is the product produced I'm sure you could take it to the bank.