It seems to work, but I don't think this is quite useful for the manuscript

src/modules/mesh/moduleMesh@elements.f90

@@ -176,6 +176,14 @@ submodule(moduleMesh) elements
 
           END DO
 
+        TYPE IS(boundaryEMFloating)
+          DO n = 1, boundary%nNodes
+            ni = boundary%nodes(n)%obj%n
+            self%K(ni, :)  = 0.D0
+            self%K(ni, ni) = 1.D0
+
+          END DO
+
         END SELECT
 
       END DO