My advice is find a job as a fitter in an airline that operates 320s otherwise your type training will expire in 3 years if you haven't worked on the aircraft.
Gain some experience then do the top up degree on distance studies or perhaps apply for an unpaid leave and do it.
The top up degree won't give you any credit in the maintenance industry as it's an aircraft designing credit, so unless you think of a career change from maintenance to designing I'd say don't bother yourself with it.