I'd be happy to take an decent upgrade offer to First!
Unfortunately, I won't stay in DXB over Christmas. I will head to Colombo to meet up with the family of my +1 which implies that I'll have to connect to Terminal 3 for my onward flight to CMB!
I'll be traveling alone as the Mrs is coming in from JFK. I really appreciate the advice regarding the Marhaba Services. However, their website isn't working at all which causes that I can't book their transfer service. I had written them an E-Mail and am waiting now for an answer! Lets see what they say.
Thank you so much for all your tips!