As a current work around I would try following this example https://github.com/openframeworks/openFrameworks/blob/master/examples/ios/KeyboardExample/src/ofApp.mm
and then just use the setText feature in the text input field https://github.com/DomAmato/ofxUIUtils/blob/master/src/ofxTextInputField.h#L68
It will take me a little to adapt things for all platforms since I mostly just develop for Windows but its always cool to see people using my addons! Image may be NSFW.
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I am always listening for feature requests and suggestions so if there is anything you find certainly let me know