Only drawback is that you have to establish the connection over your Windows PC (at least Windows 8.1 is required) and the official PS4 Remote Play program and the PSJoy server must be installed on the system.
The solution is far away from ideal but if you have a stable Internet connection it should work without any problems. You can find below some demonstration videos
PSJoy - PS4 Remote Play Spy (Requires Windows 8.1 or newer)
PSJoy Setup - How to use your Android smartphone as Dualshock gamepad for your PS4
Play PS4 Games on any Android - Remote Play 2018 with PSJoy (NO root)
The app is called PSJoy and is available for all Android devices with Android 5.0 or newer. The app will be available for free between October 22 and 28, 2018. If you have any questions feel free to contact me, feedback is desired.
Btw, if delroth decides to finish his open source project I will definitely build an Android version. As he is currently working on other projects no one should put him under pressure as it is anyway his decisions if he wants to continue his work or not. But without his knowledge in reverse engineering I doubt anyone will be able to build an Android version soon.