There's a Rom! I typed a long reply but it got deleted):
Anyway theres a Rom. No bags. Someone made the South Korea A7 2017 Android Pie One UI Rom an international version. It's for A5/A7 2017 Available worldwide!! All languages supported!!
You can try it out for yourself!!
Today i installed a custom rom android pie for my A7 2017 ... its really work great even better then officiel oreo rom ... fast and great battery ... no need to wait samsung to bring pie