You can write a small snippet to "include" parts of a template.
For example:
[[include?file=`path/to/header.tpl`]]
[[include?file=`path/to/body.tpl`]]
[[include?file=`path/to/footer.tpl`]]
include snippet can be like this:
<?php
$d = file_get_contents($file);
echo $d;
You can save those tpl part under your assets/template.
Using snippet like this has a cons: you have to clear cache when you edit file. I'm not sure that using "is static" option will auto clear cache when you editing.