Is possible, but will lead to something like:

```python
parent_lookup_regex = parent_router.get_lookup_regex(parent_viewset).replace('(?P<', '(?P<' + nest_prefix)
```

This is not DRY. Makes the internal `base_prefix` a dependency, so I fear that if one forget this ticket and change `base_prefix` it will not fail here, but will break my package, and I will not be able to be cross-version compatible.