diff --git a/plugin-designs/my-upg-100-list/data/legend-tree.js b/plugin-designs/my-upg-100-list/data/legend-tree.js
index c0cd33ef8..54bf1e97b 100644
--- a/plugin-designs/my-upg-100-list/data/legend-tree.js
+++ b/plugin-designs/my-upg-100-list/data/legend-tree.js
@@ -85,6 +85,16 @@ function leafPopulation(row, records) {
 export function buildLegendNodes(clusters, opts = {}) {
   const deafCount = opts.deafCount ?? 123;
   const records = Array.isArray(opts.records) ? opts.records : null;
+  // ★ OPTIONAL GENERATED TITLE (Driver, 2026-09-27). `opts.title(zone)` returns a localized title
+  // composed from already-translated parts, or NULL for a zone whose title cannot be generated — see
+  // data/zone-title.js. Passing nothing keeps every hand-written English label exactly as it was, which
+  // is why this is an option rather than a rewrite: the legend, the poster and the packet adopt it
+  // independently, and a caller that has no records yet (records:null) still builds a correct tree.
+  // ⚠ NULL MEANS "KEEP YOURS", NOT "NO TITLE". 18 of 28 zones decline (their labels are sub-national or
+  // taxonomic, and Intl has no subdivisions), so the fallback is the normal path, not the error path.
+  const titleOf = typeof opts.title === 'function'
+    ? (zone, fallback) => opts.title(zone) || fallback
+    : (_zone, fallback) => fallback;
   const lists = clusters.lists || [];
   const asia = clusters.asia_lists || [];
   // slice 09b-6 §1(a): wire the 7 uncovered "Frontier Asia" zones (Nepal,
@@ -137,7 +147,7 @@ export function buildLegendNodes(clusters, opts = {}) {
       {
         id: l.id,
         zoneKey: l.id,
-        label: l.label,
+        label: titleOf(l, l.label),
         // Carry the province enumeration the region-name label replaced.
         ...(l.provinceLabel ? { provinceLabel: l.provinceLabel } : {}),
         color: colorOf(l.id),
@@ -171,7 +181,7 @@ export function buildLegendNodes(clusters, opts = {}) {
       {
         id: r.id,
         zoneKey: r.id,
-        label: r.label,
+        label: titleOf(r, r.label),
         // The province enumeration the region-name label replaced. Carried through
         // like adm0/provinces above — a node rebuilt field-by-field silently drops
         // anything not named, which is exactly how adm0 and population were lost.
@@ -228,7 +238,7 @@ export function buildLegendNodes(clusters, opts = {}) {
       {
         id: u.id,
         zoneKey: u.id,
-        label: u.label,
+        label: titleOf(u, u.label),
         // Carry the province enumeration the region-name label replaced.
         ...(u.provinceLabel ? { provinceLabel: u.provinceLabel } : {}),
         color: colorOf(u.id),