Why don’t you use is_page(id of the page) check with php and redirect them off that page to the main url?
Example:
if (is_page(22)) {
//php redirect them to the main url
} else {
//normal template continues
}
EDIT:
Just to be sure, you can use is_page_template check.
if (is_page_template(templatename.php)) {
//php redirect them to the main url
} else {
//normal template continues
}