Better late than never 
Here’s an unoffiicial R release for Z5 Compact suzuran, built from the v0.20-r tag
https://www.androidfilehost.com/?fid=17825722713688244617
I have run through the same tests that I will be running on the forthcoming official v0.20-r releases and everything seems to pretty much work.
I have only tested a clean install, so be prepared to lose all your installed apps and data. There are some ways of migrating data from Q → R discussed in these forums (TWRP, SeedVault, Android backup and restore project) which may or may not work. Good luck, and have fun!