Usually hosting companies propose softaculous so that one can install applications from the hosting control pannel.
I believe that Silex should be included in it, just like concrete5:
http://www.softaculous.com/softwares/cms/Concrete5
Here is the info needed to create such a package
http://www.softaculous.com/downloads
Here is a forum post where I ask more information about submitting a new CMS
http://www.softaculous.com/board/index.php?tid=536&tpg=1
Or login with :
Enter your WordPress.com blog URL
http://.wordpress.com
Proceed