Isometric is just some fancy 2D, or 3D with a camera set up for that:I'm looking for a map in the style of iccreation but I understand that if I use a city skit map I can't upload it to steam, I think because of the copy but I'm convinced about the isometric maps.
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All the stuff mentioned before can do that...
Even 79flavors' example above is isometric.
So, I am still confused as to what you're looking for. If you want somebody else to do it for you, you can hire someone here: https://f95zone.to/forums/recruitment-services.117/ if you do not want to spend too much time or effort on it, you can try AI instead. It has some building/isometric models for sure if you look on civitai.com