Steps for excluding an interface from another interface

Is there a way to omit multiple keys at once without explicitly listing them, assuming they are already known from a specific interface?

Consider the following interfaces:

interface A {
  a: number;
  b: number;
  c: number;
  d: number;
}

interface B extends A {
  e: string;
  f: string;
}

I want to create a type that refers to an object like this:

const a: SomeType = {
  e: 'foo',
  f: 'bar',
};

I could use the Omit utility but it would be repetitive:

type OmitWithKeys = Omit<B, 'a' | 'b' | 'c' | 'd'> 

This issue persists if B has numerous keys:

type BWithoutExtend = {
  e: string;
  f: string;
};

Is there a clever workaround for this situation?

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