What is the simplest way to invoke an ODI scenario from a webpage?

Hi folks
I have a requirement where I want number of people to be able to run certain ODI scenarios when they wish.
Now I don't wish to roll out ODI Operator to these users.
I'd like to create a simple web page, with a few links/buttons that will run ODI scenarios.
Now I understand I can set up a Web application server (eg Weblogic), deploy Axis2 to this and invoke scenarios as web services etc. But this is prohibitively expensive from a licensing point of view. (And open source app server is not an option).
I do have an apache server where I can host a simple web page. Is there a way I can get this to invoke scenarios? Or some other simple way I haven't considered?
Thanks for looking

ODI Web Services. You can broadcast your scenarios as web services. Here are some good reading.
http://www.rittmanmead.com/2008/02/delving-in-to-odis-web-services-support/
http://blogs.oracle.com/dataintegration/entry/best_practices_building_data_services_with_odi-ee
http://john-goodwin.blogspot.com/2009/04/odi-series-web-services.html
http://john-goodwin.blogspot.com/2009/04/odi-series-web-services-part-2.html
http://john-goodwin.blogspot.com/2009/05/odi-series-web-services-part-3.html
http://john-goodwin.blogspot.com/2009/05/odi-series-web-services-part-4.html

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