K/L KK/L is what you have right now, if you can use vag-com.
OBD2 (iso in your case) is a different protocol.
Some of the more expensive interfaces can switch between the different protocols, and as for changing the header value, some interfaces can be reprogrammed with supplied software (ex.
www.OBD-diag.com).
As far as i know i just a matter of sending a "AT-command" just like centrafuse does right to change the specifik value (centrafuse for example turns off Echo when initializing the obd device).
I know it might sound like jibberish, i'm a bit confused myself. But it all comes down to choosing the right interface from the beginning, i've tried 3 so far and none of them has worked fully.