Okay so I stumbled upon a post that touched on this subject. For clarification on future posters I'll leave a link for the thread.
l.facebook.com
The answers here is when you already have LED Head & taillights' on your pre facelift.
Headlights conversion:
It can be done but it is quite costly. Let alone the pricing of the headlights from what I understand a new bumper and bonnet is also needed, wiring is very much different but this is more in concerns to the auto leveling and control of the headlights so a few things will also be needed for that. All in all from what I can calculate parts wise a mix of used and new will probably run up to around 3000 Euro. Then there is stil pricing of mounting/installation if not done by yourself, coding, centering and levelling of the headlights which requires special camera equipment. Way too costly/ out of my league.
Taillight's conversion:
Should be a direct plug and play according to the thread linked, I will have a go at it when I get my hands on a set of Facelift taillights.