I don't think Workbench would be legally feasible...
How bout a hybrid of Kickstart and workbench... Kickbench
Make a custom linux distribution and include AROS hosted with it. Alternatively, you could always point out in the user manual that your computers are AROS friendly and make a small user guide as how to install and run AROS. One more thing you would need are the drivers, but those could be hosted at AROS.org.
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