Canbus with Multi Function Steering wheel for ED30 and non VAG Headunit

[dTEA]

As per the title really. 

I've picked up my ED30 and put my camper plan back on hold so I've still got my PIONEER AVH4200 headunit. Its sound is miles better out of the box to the 510 so I want to put it in the ED30.

It's currently got a RCD300 in from what I can figure. I know in the last mk5 I only had to connect the ISO blocks and an ariel adapter as I wasn't bothered about dimming or speed control sound. But the ED30 has a multifunction steering wheel with highline MFD. I presume if I don't connect the right Canbus and Pioneer adapter the. I will lose all control of the MFD and steering wheel? 

Can anyone be clear on if I will lose the MFD control from the steering wheel or will it just lose volume and track control?

I was looking at these:
http://www.nexxia.co.uk/product.asp?s=Steering%20Control%20Adaptors&c=Volkswagen%20Steering%20Stalk%20Control%20Adapters&product_code=CTSVW002
http://www.nexxia.co.uk/product.asp?s=Car%20Stereo%20Fitting%20Kits&c=CT%20Stalk%20Adaptors&product_code=CTPIONEERLEAD

I'm just. It sure about the hard wired but that the stalk interface is referring to as the more info button tells you to just connect the jack after waking the system and storing a radio station?!?!