Injecting structure to ZEND_NEW

I'm trying to pass a new structure into the ZEND_NEW handler which will be used to change the behaviour of zend_fetch_class_by_name. The issue I'm having though is the operands won't support the new type unless I compile it to zval, but I can't use zend_execute_data to reference that in a pre-handler since that appears to deal exclusively with function calls. op2 is taken on ZEND_NEW for the ctor skip, which is why I can't pass a new zval directly to it. Is there another means I can pass the structure in? Dominic