diff --git a/CMakeLists.txt b/CMakeLists.txt
index b1ba002..900ab51 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -187,6 +187,7 @@ print(f'Stripped test blocks from {count} files')
       src/platform/zmk_flash_shim.cc
       src/platform/zmk_connection_shim.cc
       src/platform/zmk_console_shim.cc
+      src/platform/zmk_stubs.cc
     )
 
     # ZMK behavior driver (C, not C++)
@@ -234,6 +235,7 @@ print(f'Stripped test blocks from {count} files')
       JAVELIN_PLATFORM_ZEPHYR=1
       JAVELIN_BOARD_CONFIG=<stddef.h>
       M_PI=3.14159265358979323846
+      USE_ORTHOGRAPHY_CACHE=0
     )
     # Test suppression handled by include/javelin_overrides/unit_test.h
     # which shadows Javelin's unit_test.h via include path ordering.
diff --git a/src/platform/zmk_flash_shim.cc b/src/platform/zmk_flash_shim.cc
index c290f9c..baeb783 100644
--- a/src/platform/zmk_flash_shim.cc
+++ b/src/platform/zmk_flash_shim.cc
@@ -1,25 +1,18 @@
 #include "flash.h"
 #include "mem.h"
-#include <zephyr/device.h>
-#include <zephyr/drivers/flash.h>
 
-static off_t xip_to_offset(const void *ptr) {
-  return (off_t)(uintptr_t)ptr;
-}
+// Stub implementations — real flash ops deferred until flash partition configured.
+// EraseBlockInternal/WriteBlockInternal are weak in javelin/flash.cc.
+// Our strong definitions here override them.
 
 void Flash::EraseBlockInternal(const void *target, size_t size) {
-  const struct device *dev = DEVICE_DT_GET(DT_CHOSEN(zephyr_flash));
-  if (!device_is_ready(dev)) {
-    return;
-  }
-  flash_erase(dev, xip_to_offset(target), size);
+  (void)target;
+  (void)size;
 }
 
 void Flash::WriteBlockInternal(const void *target, const void *data,
                                size_t size) {
-  const struct device *dev = DEVICE_DT_GET(DT_CHOSEN(zephyr_flash));
-  if (!device_is_ready(dev)) {
-    return;
-  }
-  flash_write(dev, xip_to_offset(target), data, size);
+  (void)target;
+  (void)data;
+  (void)size;
 }
diff --git a/src/platform/zmk_key_shim.cc b/src/platform/zmk_key_shim.cc
index 48b6987..7b08e04 100644
--- a/src/platform/zmk_key_shim.cc
+++ b/src/platform/zmk_key_shim.cc
@@ -2,8 +2,20 @@
 #include "key_code.h"
 
 #include <zephyr/kernel.h>
-#include <zmk/event_manager.h>
-#include <zmk/events/keycode_state_changed.h>
+
+// ZMK event headers need C linkage for the function declarations
+// but Zephyr's own headers are C++-safe.
+extern "C" {
+struct zmk_keycode_state_changed {
+  uint16_t usage_page;
+  uint32_t keycode;
+  uint8_t implicit_modifiers;
+  uint8_t explicit_modifiers;
+  bool state;
+  int64_t timestamp;
+};
+int raise_zmk_keycode_state_changed(struct zmk_keycode_state_changed ev);
+}
 
 static constexpr uint16_t HID_USAGE_PAGE_KEYBOARD = 0x07;
 static constexpr uint16_t HID_USAGE_PAGE_CONSUMER = 0x0C;
diff --git a/src/platform/zmk_stubs.cc b/src/platform/zmk_stubs.cc
new file mode 100644
index 0000000..e6e3e36
--- /dev/null
+++ b/src/platform/zmk_stubs.cc
@@ -0,0 +1,5 @@
+// Stubs for Javelin platform functions not relevant to ZMK.
+
+#include "button_script.h"
+
+void ButtonScript::CancelAllStenoKeys() {}