Is it possible to just add an excerpt meta box by copying the code used in meta-boxes.php from, say, the Post meta box section to the Team meta box section?

// CUSTOM EXCERPT SECTION
array (
'name' => '',
'title' => 'Custom Excerpt',
'id' => "{$prefix}heading_custom_excerpt",
'type' => 'section'
),

// CUSTOM EXCERPT
array(
'name' => 'Custom excerpt',
'desc' => "You can optionally write a custom excerpt here to display instead of the excerpt that is automatically generated.",
'id' => "{$prefix}custom_excerpt",
'type' => 'textarea',
'std' => "",
'cols' => '40',
'rows' => '8',
),