i believe android 11 emulator is available for android studio. (probably also for intellij idea, which is what android studio uses). both free, if that's what is required. you don't have to develop with either. just run the emulator. b4a will see it. see
here i got rid of android studio, but i still use a pixel3a emulator with intellij idea.
speaking of pixel3a, for about US$100 you can get one on ebay. if you hurry, it will still upgrade to android 11. mine has received regular updates directly from google, the latest a month ago. i believe the update window for pixel3 closes in a few months.