First; I'm sorry this turns out in a English conversation and also it's off topic!
Correct, the A8 D2 rims are forged rims, have a flat back and can be considered very strong to add some other lochkreis. I would not consider making extra lug holes in a normal cast rim.
As an example a picture from a company which alters rims for autocross:
It's an A3 pepperpot. Would you install it?
I would not, but on a light vehicle on a track it can widstand incredible forces without deforming, and shows how strong forged rims are (also note the extra created lochkreis, 5x130 in this case).
Personally I don't want adapters, I don't mind if people are using them.
Another lochkreis in forged rims is secure, although others will say; no it is not.
It's a conversation which has no end, and I'm not going there anymore.
Oh, just to tease......😜 Picture;