How to change stuff in three.js using dat.gui?

Question

JavaScript

I wrote the following code to change the gender in the scene

action_floor_glass.onChange( function (opt_none) {
    if (opt_none== true){	
  geometry_floor2.visible = false; 
  geometry_floor1.visible = true; 
  }  
    if (opt_none== false){
  geometry_floor1.visible = false;
  geometry_floor2.visible = true;
  }
} );


  var plane_gam = new THREE.PlaneBufferGeometry( 2000, 2000 ) ;
 
  var glass_mat = { clipBias: 0.003, textureWidth: window.innerWidth * window.devicePixelRatio, textureHeight:  window.innerHeight * window.devicePixelRatio, color: 0x889999, recursion: 1 } ;
  
  var plane_mat = new  THREE.MeshStandardMaterial( { color: 0x808080, roughness: 0, metalness: 0 } ) ;					
        
  var  geometry_floor1 =  new THREE.Reflector(plane_gam,  glass_mat);
  geometry_floor1.rotation.x = - Math.PI / 2;
  geometry_floor1.receiveShadow = true
  geometry_floor1.visible = false;
  scene.add(  geometry_floor1 );
 			
  var  geometry_floor2 = new THREE.Mesh( plane_gam, plane_mat );
  geometry_floor2.rotation.x = - Math.PI / 2;
  geometry_floor2.receiveShadow = true;
         
  scene.add(  geometry_floor2 );

Everything works as it should.
But I'm interested in the question whether it is possible to somehow shorten this code
So that it would not change the object itself, but its properties (material)?