I recently had a great experience working with Sam, who enabled the Matrix LED headlights on my US spec RS3. I really wanted the Matrix light functionality and messaged him last year after reading people's experience working with him on the RS6 forum. He was able to figure out the coding recently, and I had him code my car a few weeks ago.
If you're interested in doing the same, here's Sam's contact information via WhatsApp: https://wa.me/message/TIU47IVLI7DIB1 or (647) 521-4279 (NPG Technology Corporation).
The whole process takes about 45 minutes, and Sam will guide you through each step as he remotes into your car. You'll need a Windows computer and he was able to send me the VAS5054A/VAS6154 loaner cable.
I'm not affiliated with Sam or his company, just a fellow enthusiast passing along the info for anyone that's interested.
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