If you consider this "prior to sprint zero" approach a bit heavy-handed, I would offer a simple test to assess its reasonableness. Play with a number of IT Service Management (ITSM) products that you picked in random. Once you did so, compare the numbers of those that clearly have services at their core, to the number of those that integrated services into their user interface as an afterthought.
Granted, the test was originally conceived to make a point with respect to the timing of user interface architecture tasks in the cycle of Agile software development. However, it is actually applicable to ITSM products in general. For example, the results of the test cited above are indicative of how far a system management vendor shifted his mindset, architecture, technology and practices from servers to services.
I would actually go one step further to suggest the user interface architecture test as a reliable "bullshit detector" for vendor hype. Whenever a fundamental application paradigm change takes place, the degree to which a vendor embraced the change can be tested by examining the orientation of the user interface. As a potential customer, it tells you how seriously the vendor walks the talk with respect to embracing paradigm changes and investing in so doing in earnest.