How about a layer of galvanized chickenwire? I don't suppose it would be possible to place it between the ICF and a layer of peel and stick?

Large cats. No, seriously. Spread used kitty litter around the perimeter of the house.
Its cheap, easy, and relatively non toxic. If that doesn't cause the mice to relocate, contact your pest control specialist.

The kitty litter idea is interesting, although the wife probably wouldn't mind having
a few more cats!

My first question is "Why and where do you have exposed ICF?"

Two ICF companies that I know about have the option of mixing borax into the ICF for pest control. Perhaps sprinkling that around the perimeter, or problem area might deter them. Moth balls might be another option (but in both cases they should not be on the surface.

A coat of concrete should deter any set of mice teeth.

My first question is "Why and where do you have exposed ICF?"

Two ICF companies that I know about have the option of mixing borax into the ICF for pest control. Perhaps sprinkling that around the perimeter, or problem area might deter them. Moth balls might be another option (but in both cases they should not be on the surface.

A coat of concrete should deter any set of mice teeth.

Below grade even if not water-proofed, should not be a problem. Cladding above grade to eve, soffit, fascia should all keep mice out. Which should leave no more that a few inches from just below grade to siding, cover that area with a trowel on, brush on or roll on parge coat. There is lots to choose from, all acrylic and cement acrylic, one coat, two coats and they are tint-able and paint-able.

I have never heard of one of my customers having an issue with mice, in fact the opposite, and in MN we have lots. It is difficult to keep mice out of a conventionally framed house.

I did have a carpenter ant problem, I put 6 yards of community wood mulch along one side of my garage. Days later I pressure washed the interior of the garage walls. I think I created a good environment for the ants by adding the moisture which surely got behind the sheet metal interior wall, the ants tunneled a nest in the EPS. But luckily I had ICFs, with wood framing they could have eaten away at the structure. To fix I vacuumed the ants, foamed their tunnels and nest and put out some poison.