Rather than repeating the .xblock-wrapper phrase with this class, why not apply two classes to any wrapper-xblock element and provide a nested case in your sass for these different levels (see below)?

```html
<section class="wrapper-xblock level-element"></section>
```

```scss
.wrapper-xblock {
  
  // CASE: element-level xblock rendering
  &.level-element {

  }
  
  // CASE: nesting-level xblock rendering
  &.level-nesting {

  }
  
  // CASE: page-level xblock rendering
  &.level-page {

  }
}
```