Make my Android app to fully kiosk mode when enabled

I am trying to make my feedback app to support fully kiosk, I have tried a lot of solutions but Nothing is completely satisfying my need. Here are the things that I found yet.

1. Make my app as Device Admin/Owner App(Lock Task) -

If we follow this link/procedure https://developer.android.com/work/dpc/dedicated-devices/lock-task-mode, some limitations are there as follows -

a. We have to factory reset all the devices where Feedback app is installed, follow some steps to make it as admin app(launcher app).

b. Installation of the app will be possible using the command line, each installation will take some line of code through cmd, which means for installing a person has to go there with the computer and connect the device with USB and then install the app using commands.

c. Update on an app will also follow the same procedure (Couldn't be performed using google play store)

d. In this case, end-user will never be able to exit from our app, restart the device would also launch the same feedback app every single time.

2. Programmatically screen pinning + programmatically volume and power button controlling. (https://github.com/mrugacz95/kiosk)

a. In this, we will make the app in screen pinning mode where all the three bottom buttons(Overview, home, recent) will be hidden/disabled. and same with the power key and volume keys.

b. So As soon user clicks on kiosk mode, a screen pinning system generated prompt would be shown to user But the biggest disadvantage of it is that app would be unpinned/unlocked as soon as the user presses overview+recent buttons together.

3. The third Case is, where all the keys are controlled including power+voulme+back+overview etc. Only pressing home will make the app to go on the background and within seconds it will again come foreground.

So all I found up until now, is not very satisfiable. One more Question-

Is this something to be fully controlled by MDM(Mobile Device Management)?

Any help is appreciated.

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