A small batch of these kits are now for sale, complete with a special cable harness for nice plug-and-play installation. The installation itself takes about 10 minutes. Link to installation guide.
The complete plug-and-play interface kit can be purchased for €65 (includes shipping).
Contact email@example.com for more details and current availability status.
Update: the kits are out of stock at the moment. When they become available again, this page will be updated, but if you're interested in the kit, send an e-mail to the above address anyway, then there's a fair chance you get notified when they are back in stock.