You could use the filter theme_page_templates
present since 3.9.0
like so:
function my_theme_page_templates( $page_templates, $this, $post ) {
$travel_blog_id = 2;
$blog_id = get_current_blog_id();
if($blog_id != $travel_blog_id) {
if(isset($page_templates['page-travel.php'])) {
unset($page_templates['page-travel.php']);
}
}
return $page_templates;
}
add_filter( 'theme_page_templates', 'my_theme_page_templates', 20, 3 );
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