Adding to @makara’s reply. Keyman Desktop uses keyboards compiled to a .kmx file while Keyman for Android uses touch layout keyboards compiled to .js files.
While a touch layout for UTB Unicode keyboard is currently unavailable, we do have a tech support member who has been creating a touch layout for the SIL IPA keyboard. Perhaps you can try installing that keyboard and see if it handles the characters you want. His test page also provides a link if there’s characters that need to be added.
From your Android phone that already has Keyman installed
- Browse to Scott’s Test Page for Keyman.
- Click on the blue “ipauni15 Keyboard” button. This should trigger Keyman for Android to prompt about installing the keyboard.