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I forgot how I did this, sorry. But it was actually by just using the main query in the Beaver Builder posts module, and modifying that query via functions.php using this, which I assume I got from your site:

function tas_not_listened_fl_builder_loop_query_args_filter( $query_args ) {
    if ( 'tas-metabox-not-listened' == $query_args['settings']->id ) {
        $user_id = get_current_user_id();
        $post_ids = get_user_meta( $user_id, 'mbfp_posts', true );

        if ( ! empty( $post_ids ) ) {
            $query_args['post__not_in'] = $post_ids;  // Exclude the post IDs
        } 
    }
    return $query_args;
}
add_filter( 'fl_builder_loop_query_args', 'tas_not_listened_fl_builder_loop_query_args_filter' );

Thanks - any word on when this might happen?
If not, is there a way we can speed it up?

We are using the button as a 'Mark completed' button so we'd really like to use the check circle icon.