I would give admiralrangers suggestion a try, or at least a look at.
Wouldn't install the wheel as such, just temporarily hook up the rotary coupler and remote dongle thingy.
You reckon the aftermarket radio went in without any mods to the LR wiring, hence the std radio plug??
So the std plug in the disco fit the new radio fine. 
I have a few D2s now, one of them is a 'hiline' ... car isn't call hiline, but has the fancy-schmancy 1.5DIN radio head plus CD changer and whatever additional speakers.
In terms of hiline and 'lower line' remote controls, according to the electrical library they're all one and the same.
That is, doesnt' matter if hiline or not, the circuit diagram does look a bit different, as there are other/additional connections and wires in the hiline loom, but the two wires from remote that feed to the radio head unit still connect to the same connector same pins at the radio end anyhow. 
So hi end and low end use the same radio connector. C0098(radio end). 
The loom that SF talks about seems to go to a connector under the stg colums on the LHS of it. There should be four connectors mounted to the frame, arranged vertically. Two top are both black, then third down is white and bottom one is orange. So you have this setup? Take photo and post it. Black connector second from top is where the loom from the steering wheel control/coupler goes to, the hard mounted connector(C0067), the removable connector(C0229) is the one then heads to the radio connector. 
ps. you dont' need fancy software to view rave files. They're just pdfs. so any pdf viewer will do, and still search terms and stuff. 
I just use a plain ol(lightweight) pdf viewer to find stuff on RAVE. The hard bit about RAVE is knowing which pdf files you need to open. 
If you want, I can somehow send you the pdf files you need, just open them with your preferred pdf viewing program. 
and ps. if you have never used 
THESE solder/heatshrink wire connectors, I suggest you should try them. I've been using them maniacally for the past few years. so easy to connect broken wires together again. But you need a heat gun with a 180° deflector for best results.
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