You’ve kinda answered your own question there. That’s what CAD is for. To create what you’re after, you’d be using the same backend capabilities which are already computationally expensive, mapped out within a game engine. The result would likely be an expensive bit of training/simulation software that’s redundant to both engineers and machinists, and out of the price range of any home builder.
Accessibility is what you’re after, and I can sympathise. I think ANSYS Discovery was made with that in mind, and it’s available in the academic version.
I generate models with code and use a pythonic API to automatically simulate them in testbed conditions. It wouldn’t be far off to create extra scenarios, but each time you make one it would take a bit of knowledge to put together.