I would go, perhaps, with the same basic stain color or undertone for the perimeter counters as the island, but in a different value... Darker or lighter, so the island has some additional character, separating it from the counter color.

What style is your island? We have some stainless on our perimeter counters, but stainless on the island counter, central to the room and bigger, can be cold ...or wonderful, depending on the style and color of the island. You might already be aware that it'll dent and scratch, so you have to appreciate patina.

I think you might be trying to match things that have no relationship to keep from having too much going on. But, if I can be honest, I think joining things like island and perimeter counter, and island counter and the range backing doesn't really make sense and can draw the eye in a way you might not like, and actually make the room seem busier. Let things stand alone and create a focal point, or decide on elements you want to showcase, allowing them to be a little different to stand out.

If you have a line drawing of the kitchen, or a 3D view that you can add color to and try different options, it could really help you create the vision you want.

It sounds like you might be going for a period look in which some unfittedness could be appropriate, so things don't have to match.

Do you have some samples of the colors and materials, and maybe a view of the kitchen you can show here?