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After reviewing FCV_AND_FEATURE_FLAG_README and the MongoDB manual (e.g. https://www.mongodb.com/docs/manual/release-notes/5.0-upgrade-sharded-cluster/#std-label-5.0-upgrade-sharded-cluster) it's clear that approach 2. is appropriate.
We want the QueryAnalysisWriter service to start with the new binary 7.0 (for example), but if FCV is an earlier version, these services will not do anything. That is, the functionality of these services are gated by the feature flag check for the FCV.
This means that there is no action needed for QueryAnalysisWriter when the set FCV command runs.
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