Trying to display a menu_block via module_invoke as if the current page is different than it actually is

The current page isn't associated with a menu item. I am trying to get menu_block to display as though it were on a different page. Toyed around with menu_set_item but couldn't get anywhere with it.

$block = module_invoke('menu_block', 'block', 'view', 1);
print print_r($block);

Any help would be appreciated.