wcbvp_enable_variations_grid.php

<?php
/**
 * Enable/disable the grid for specific product IDs
 */
function prefix_enable_variations_grid( $enable, $product_id ) {
  // Only enable these products
  if( in_array( $product_id, array( 123, 456, 789 ) ) ) {
    return true;
  }
  // Don't enable these products
  if( in_array( $product_id, array( 987, 654, 321 ) ) ) {
    return false;
  }
  return $enable;
}
apply_filters( 'wcbvp_enable_variations_grid', 'prefix_enable_variations_grid', 10, 2 );