COREYZ Conditionals, SanityCheck for only a single kinematic

Marlin/Conditionals.h

@@ -315,11 +315,17 @@
    * CoreXY and CoreXZ
    */
   #if ENABLED(COREXY)
+    #define CORE_AXIS_1 A_AXIS // XY from A + B
     #define CORE_AXIS_2 B_AXIS
-    #define CORE_AXIS_3 Z_AXIS
+    #define CORE_AXIS_3 Z_AXIS // normal axis
   #elif ENABLED(COREXZ)
+    #define CORE_AXIS_1 A_AXIS // XZ from A + C
     #define CORE_AXIS_2 C_AXIS
-    #define CORE_AXIS_3 Y_AXIS
+    #define CORE_AXIS_3 Y_AXIS // normal axis
+  #elif ENABLED(COREYZ)
+    #define CORE_AXIS_1 B_AXIS // YZ from B + C
+    #define CORE_AXIS_2 C_AXIS
+    #define CORE_AXIS_3 X_AXIS // normal axis
   #endif
 
   /**

Marlin/SanityCheck.h

@@ -387,6 +387,16 @@
 
 #endif
 
+/**
+ * Don't set more than one kinematic type
+ */
+#if (ENABLED(DELTA) && (ENABLED(SCARA) || ENABLED(COREXY) || ENABLED(COREXZ) || ENABLED(COREYZ))) \
+ || (ENABLED(SCARA) && (ENABLED(COREXY) || ENABLED(COREXZ) || ENABLED(COREYZ))) \
+ || (ENABLED(COREXY) && (ENABLED(COREXZ) || ENABLED(COREYZ))) \
+ || (ENABLED(COREXZ) && ENABLED(COREYZ))
+  #error "Please enable only one of DELTA, SCARA, COREXY, COREXZ, or COREYZ."
+#endif
+
 /**
  * Allen Key Z probe requires Auto Bed Leveling grid and Delta
  */