Greetings from the UK.... I found this thread a few days ago, whilst looking at wireless carplay adaptors.
I bought a Carlinkit "wireless carplay activator" for my 2017 Audi S4 with factory (wired) carplay. I got it from Aliexpress - shipped to the UK in less than two weeks, and I paid about £82 GBP for it - a bargain in my view.
(Here's the link if anyone's interested:
https://www.aliexpress.com/item/33046258222.html?spm=a2g0s.9042311.0.0.45674c4ddE2kfm )
It works very well indeed - I'm surprised at how good it is in fact. It's running the 2019.11.11 software release - not a hint of Chinese text anywhere (which I was prepared for!) and no issues, no problems, no lag (that I can detect), it's great.
Previously I've been running wired carplay for many months, which had obviously improved with iOS13 and the ability to use Waze, with dark mode and split screens etc. This Carlinkit dongle thing works exactly the same - it's plug and play and everything seems to work exactly as it did when wired. I can now use my Qi charger and just drop the iPhone (11 Pro Max running latest iOS 13.2.3 ) in the arm rest - perfect!
Here's a few pics from my car: