How to handle breaking changes to Jihu in overrides

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In https://docs.gitlab.com/ee/development/jh_features_review.html we document a process, specifically how classes can be overridden in the JiHu repository using modules defined in the jh namespace.

How do we handle changes to gitlab-org/gitlab that would break overrides in gitlab-jh/gitlab? For the EE vs. FOSS case, we have specs that can run in the same pipeline, but as the docs state, we don't have that for JiHu.

An example of a breaking change like this is a class rename: !64238 (comment 611370418)