It is possible to get both Zend and Ioncube working on same server. You need to ask a server admin to do this.

See the phpinfo

http://video.bizhat.com/phpinfo.php

That have both

This program makes use of the Zend Scripting Language Engine:
Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies
with the ionCube PHP Loader v3.1.31, Copyright (c) 2002-2007, by ionCube Ltd., and
with Zend Extension Manager v1.2.0, Copyright (c) 2003-2006, by Zend Technologies
with Zend Optimizer v3.2.6, Copyright (c) 1998-2007, by Zend Technologies