Haha what a coincidence, I bought a 9eSIM adapter a few weeks ago! There is a new eSIM-only card in Germany where you get 3 GB of data plus unlimited SMS and calls per month for free. To order it I had to use Frida and the Android emulator to fool the app into thinking the device had an eSIM. After that you have to do some JavaScript shenanigans on the website to get the QR code. But after that, everything works flawlessly with the eSIM adapter. The card is called "GMX FreePhone".