I was working on this but noticed some complications in trying to change over to the new SVGs (from font icons):

• lib/src/shared/screen.dart is the file defining icons for each page as a ScreenMetaData
• ScreenMetaData expects icon to be IconData. I thought the icon font was being used in navigation, but actually this is only for within tests. So potentially if switchToScreen in tests (e.g. in integration_test/test/live_connection/memory_screen_helpers.dart) can be done with some other mechanism, then this won't be a difficult change.
• The other change needed is for Screen to take an icon directly