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I later realized that the major inconvenience in my solution, the touch input, can be stopped if I use Tasker's scenes in overlay blocking mode.

_{(Click image to enlarge)}

I created several blank scenes and configured task to display them in such a way, that only a small fraction of screen can send touch input to app (fraction is allowed because I need to do input tap). The Manage ROMs window works well with DPAD key events so I used Task → Input → Dpad to reach my preferred ROMs entry and tap it.

To disable input from navigational keys, I used Xposed Additions Pro. Here are the relevant instructions. (Follow instructions there up to step 10.)

I also successfully tested AutoInput as an alternative for Xposed Additions. In a task, its relevant usage is:

Plugin → AutoInput → Modes:

1. Configuration:

   1. Key Suppress: Enable
   2. Keys: your navigation key

2. Timeout (Seconds): None

Make sure to enable its accessibility service in Settings → Accessibility.

This solution is not convenient as much as my other solution is, but it gets the job done.