v6.1-beta.0 is released with support for SOCKS proxies both in iOS (via TestFlight) and Android (via Github releases as direct APK download).
You can host your own SOCKS proxy (this one looks good:
) or you can try ours, if you use preset servers (it won't allow connecting to any other servers directly, but you can still send messages to anybody who uses other servers):
Address: 139.162.173.97
Port: 443
Username: user
Password: YJHolWSzTfOny7es