IIRC anything below a class 2 Hyperdrive in WEG was illegal on non-Imperial Ships, yet I can't find anything in EotE to suggest Class 1 and 0.5 drives are illegal in this system.
So.. is our GM using WEG splat to screw us over as players to fork out C6400 if we fail a negotiation roll and then an as yet unknown amount of credits to falsify the BoSS ship registration to get up to a 0.5 hyperdrive? Page 151 of the core rules sucks big time....
Seriously, this kind of thing needs official splat from FFG