Android Extracted Text UI: Customizing context menu items

Question

I have an EditText with a custom ActionModeCallback to display additional context menu items via setCustom[Insertion/Selection]ActionModeCallback.

If the field is selected, and the screen is rotated, some keyboards display an Extracted Text UI, which no longer has the custom menu items.

Is there a means for me to either take control of the context menu items in the Extracted Text UI, or provide these items to the UI?

I'd prefer not to disable the Extracted Text UI if possible.

It seems that I can do this via a subclass of InputMethodService: How to modify the ExtractedEditText for a custom keyboard in Android. But this appears to define a system-wide IME, which isn't ideal.

Is there a better way to go about this?

Refs:

• What's the Android "Extracted Text UI"?
• https://developer.android.com/reference/android/inputmethodservice/ExtractEditText.html

Thanks in advance,