Figured out that I don't need a special screen, just send events to the component directly with OnEvent. However, you have to component->Add() or call Render(component, []) with it or else it's not considered a child.

meson.build

@@ -49,7 +49,6 @@ roguish = executable('roguish', [
   'render.cpp',
   'config.cpp',
   'save.cpp',
-  'sfml_screen.cpp',
   'panel.cpp',
   ],
   dependencies: dependencies)