What is Reddit's opinion of BlueputDroidPro?

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or any of the other remote apps which require a java server app on the desktop?

I'd like to see something like blueputdroid but updated to work with newer devices(different bluetooth stack, I believe)

A long time ago, when Bluez was still used as the Android Bluetooth stack, Blueputdroid was able to act as HID keyboard on a rooted phone.

Since the change to the bluetooth stack it is a no go now a days iirc.
Here is what used to work.
- BlueputDroidPro – Android Apps on Google Play - https://play.google.com/store/apps/details?id=berserker.android.apps.blueputdroidpro

I would suggest a usb keyboard.

Does the PS4 allow Bluetooth Keyboards?

If yes, maybe an app like this one could help: https://play.google.com/store/apps/details?id=berserker.android.apps.blueputdroidpro