diff --git a/deployments/sequencer/configs/overlays/hybrid/common/dummy_for_testing/chain_params.jsonnet b/deployments/sequencer/configs/overlays/hybrid/common/dummy_for_testing/chain_params.jsonnet
new file mode 100644
index 00000000000..4e52aa213d0
--- /dev/null
+++ b/deployments/sequencer/configs/overlays/hybrid/common/dummy_for_testing/chain_params.jsonnet
@@ -0,0 +1,7 @@
+// Dummy env-shared P2P multiaddr stand-ins for the `prepare-production-overlays` CI job's env-only
+// native synth (standing in for the devops env-common layer). Flat keys, matching what `build` reads.
+// Imported by each env's node.jsonnet and merged onto the env's real chain_params.
+{
+  consensus_bootstrap_peer_multiaddr: null,
+  mempool_bootstrap_peer_multiaddr: null,
+}
diff --git a/deployments/sequencer/configs/overlays/hybrid/common/dummy_for_testing/node_params.jsonnet b/deployments/sequencer/configs/overlays/hybrid/common/dummy_for_testing/node_params.jsonnet
new file mode 100644
index 00000000000..4b5f0a9a8ae
--- /dev/null
+++ b/deployments/sequencer/configs/overlays/hybrid/common/dummy_for_testing/node_params.jsonnet
@@ -0,0 +1,7 @@
+// node_params for the `dummy_for_testing` overlay (hybrid layout).
+// Supplies the dummy per-node value the `prepare-production-overlays` CI job needs for env-only
+// synth (standing in for the devops per-node layer).
+{
+  validator_id: '0x64',
+  node_index: 0,
+}