First of all, I for one would very much prefer to believe that policymakers, that is, people who have the power to make and enforce policies, have much better resources at their disposal than a two hour workshop.
They ought to have an entire apparatus of civil servants with access to modelling tools, they ought to have an entire research department ready to tell them whether such policies have been already tried elsewhere and what their consequences were, they ought to have access to think-tanks more than happy to develop forward-looking whitepapers and so on.
Especially in the field of economic policies I would surely expect that any policies would be modelled in accordance with various economic frameworks, with the results presented in a set of good-looking graphs and tables, ready to be input in the multicriterial decision method of choice. Economics is supposed to be a science, isn't it?
This Stack Exchange site is oriented towards helping with the development of fictional worlds. It's fantasy. It's not the real world. The key aspects of worldbuilding we are interested in are aesthetic beauty, consistency and verisimilitude. While this site does occasionally receive questions tagged "reality-check", some of which have a certain link to real-world economics, and we do try to answer them to the best of our knowledge, I would say that most people on this site would be unhappy to hear that somebody has taken their answers as suggestions for real-world policy making.
These being said, there are of course very many resources to help with kick-starting worldbuilding.
If you want to pay some money, there are the Worldbuilding Kits sold by r-n-w. I'm certain that they would be happy to provide a custom quotation for a license to use their materials in workshops and seminars aimed at powerful policymakers. They sell a Worlbuilding Essentials kit, a Monsters and Encouters kit, a Landbuilder kit, a Town and City Builder kit, a People and Society kit, plus a History Pack. It's true that their kits are strongly oriented towards the highly stilized worlds of role-playing games, but hey, they provide fillable forms! Ideal for use by our elected betters.
Worldbuilding Kit is a Tumblr site dedicated to collecting ready-made worldbuilding resources; check out, for example, The Rough Copy's summary of worldbuilding resources to be found at Let Me Explain to You a Thing by Clevergirlhelps.
One could never omit the splendid Zompist created by Mark Rosenfelder; while admittedly geared mostly towards advertising their language and world construction kits, the site is a joy to peruse.
The Dabbler, "SEO Strategy Consultant and Freelance Writer", offers a great Ultimate List of 42 Worldbuilding Resources. Notable is the 30 Days of WorldBuilding step-by-step guide offered by Stephanie Bryant under the Creative Commons BY-NC license.
And finally, if you are interested in worldbuilding professionally you may want to take a look at the The Routledge Companion to Imaginary Worlds by Mark J.P. Wolf (Editor), blurbed as "a definitive and cutting-edge guide to the study of imaginary and virtual worlds across a range of media, including literature, television, film, and games". (The link goes to Amazon; it's not a cheap book.)
There are of course quite a few webinars and online courses to help with worldbuilding; for example, The Building Blocks of Worldbuilding for All Genres OnDemand Webinar at Writer's Digest Shop, or the Worldbuilding in Speculative Fiction online course at Hugo House. Beware, they might be considered expensive.