How to "Deep Replace" in an object

[llamington]

I would like to "deep replace" properties of an object (essentially Replace but recursive). For example:

interface Foo {
    a: {
        b: string
    }
    c: string
}

DeepReplace<Foo, string, number> would give:
{
    a: {
        b: number
    }
    c: number
}

Is this currently supported? If not, is there any plan to add this to the official types?