Conditionally remove variations from frontend

Hi,

I have three attributes, and I would like to conditionally hide one or two from the front end depending on site lang.

Attributes are, size(cm), color, size(in).

A single product page will either display size(cm) and color, or size(in) alone.

In the back-end, here is a short version of what my variations look like:

Size(cm) Color Size(in)

1- [50] [red] [any]
2- [any] [any] [20]

I use this function to unset the attribute that I don’t need

if ( sitelang === 'fr' ){
add_filter( 'woocommerce_product_get_attributes', 'my_attribute_hider' );
  function my_attribute_hider ( $attributes ) {
    if ( isset( $attributes["pa_size-in"] ) ){
      unset( $attributes["pa_size-in"] );
    }
}

if ( sitelang === 'en' ){
add_filter( 'woocommerce_product_get_attributes', 'my_attribute_hider' );
  function my_attribute_hider ( $attributes ) {
    if ( isset( $attributes["pa_color"] ) ){
      unset( $attributes["pa_color"] );
    }
    if ( isset( $attributes["pa_size-cm"] ) ){
        unset( $attributes["pa_size-cm"] );
    }
}

Price of variation #1 will always override price of #2 .. so on single product pages where only the attribute Size(in) is available, price will be wrong .. If I re-arrange the variations order now price of pages that have the attributes Size(cm) and Color will be wrong.

Any idea how one would achieve this ?

I tried this filter with no luck:

add_filter('woocommerce_available_variation', 'remove_variation');
function remove_variation( $variation ){
  if ( !empty($variation['attributes']['attribute_pa_color']) ){
  return $variation;
  }
  else{
    return '';
  }
}