🚸 Laser with only PWM pin (#24345)

Marlin/src/feature/spindle_laser.cpp

 void SpindleLaser::init() {
   #if ENABLED(SPINDLE_SERVO)
     servo[SPINDLE_SERVO_NR].move(SPINDLE_SERVO_MIN);
-  #else
+  #elif PIN_EXISTS(SPINDLE_LASER_ENA)
     OUT_WRITE(SPINDLE_LASER_ENA_PIN, !SPINDLE_LASER_ACTIVE_STATE);    // Init spindle to off
   #endif
   #if ENABLED(SPINDLE_CHANGE_DIR)
   }
 
   void SpindleLaser::set_ocr(const uint8_t ocr) {
-    WRITE(SPINDLE_LASER_ENA_PIN,  SPINDLE_LASER_ACTIVE_STATE); // Cutter ON
+    #if PIN_EXISTS(SPINDLE_LASER_ENA)
+      WRITE(SPINDLE_LASER_ENA_PIN,  SPINDLE_LASER_ACTIVE_STATE); // Cutter ON
+    #endif
     _set_ocr(ocr);
   }
 
   void SpindleLaser::ocr_off() {
-    WRITE(SPINDLE_LASER_ENA_PIN, !SPINDLE_LASER_ACTIVE_STATE); // Cutter OFF
+    #if PIN_EXISTS(SPINDLE_LASER_ENA)
+      WRITE(SPINDLE_LASER_ENA_PIN, !SPINDLE_LASER_ACTIVE_STATE); // Cutter OFF
+    #endif
     _set_ocr(0);
   }
 #endif // SPINDLE_LASER_USE_PWM

Marlin/src/inc/SanityCheck.h

   #define _PIN_CONFLICT(P) (PIN_EXISTS(P) && P##_PIN == SPINDLE_LASER_PWM_PIN)
   #if BOTH(SPINDLE_FEATURE, LASER_FEATURE)
     #error "Enable only one of SPINDLE_FEATURE or LASER_FEATURE."
-  #elif !PIN_EXISTS(SPINDLE_LASER_ENA) && DISABLED(SPINDLE_SERVO)
-    #error "(SPINDLE|LASER)_FEATURE requires SPINDLE_LASER_ENA_PIN or SPINDLE_SERVO to control the power."
+  #elif NONE(SPINDLE_SERVO, SPINDLE_LASER_USE_PWM) && !PIN_EXISTS(SPINDLE_LASER_ENA)
+    #error "(SPINDLE|LASER)_FEATURE requires SPINDLE_LASER_ENA_PIN, SPINDLE_LASER_USE_PWM, or SPINDLE_SERVO to control the power."
   #elif ENABLED(SPINDLE_CHANGE_DIR) && !PIN_EXISTS(SPINDLE_DIR)
     #error "SPINDLE_DIR_PIN is required for SPINDLE_CHANGE_DIR."
   #elif ENABLED(SPINDLE_LASER_USE_PWM)