Loved SimCity growing up.
Would it be possible to automate porting the windows version into a mac or web version? Like giving a long-running agent the task and some tools to check/play the game on both platforms?
At this point you can probably just run it with proton or wine. Why bother porting the whole thing?
SimCity 4 has a native Mac build, it's on Steam. Most of the modding community uses Windows now though since the .dll hacks became feasible.