http://www.bft.co.uk/jsp/en/home/index.jsp
BFT is one of the top 3 (order of who is 1st and who is 2nd depends on personal preference and experience) gates/garage door automation manufacturers. Hence they gear isn't always cheap.
I'm sure you can cheaply hack it, but my idea is way much simpler and quicker, no control units, wiring etc.
What you do is buy the interior light unit with home link button.
Take all the internals from your remote. Fit them behind the light unit, even a hot glue will do. De-solder open/close button (my gates you open and close with one same button)
Take some wires and solder the home link button to the remote's pcb using these wires and that's it.
Simples 
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2006 D3 S8 5.2 V10
Ceramic Brakes, Bang&Olufsen, DTV, DAB, Rear Camera, BT, TPMS, Soft Close, Auto Boot, AMI , 4 Zone AC, Home Link, All Electric Blinds, Fingerprint, Ski Hatch, Black Extended Leather, Heated Sport Seats, Alacantra, Carbon Trim inc Aluminium Pack 2.
2015 A3 S line 1.4 TFSI - for the missus to keep her away from my car.
Standard S-line equipment, no extras.
2006 D3 A8 3.7 V8 - SOLD but not forgotten
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