At least for libdnf5, BaseMaker is the only code that does not involve monkeypatching. It'd be nice to split each backend's implementation into a separate module so it can be accessed without affecting global state.

• backends
  • base_maker
    • base
    • dnf
    • libdnf5
  • base
  • dnf/libdnf5
    • __init__.py with function to get BaseMaker impl
    • backend
      • __init__.py with re-exported BaseMaker