rrent hole size could be pushed sideways & cut, if not ideally. You might a lso get mileage out of those filing drill bits, but I bet a big fat spiral blacksmith's bit would be much better - and more expensive.
it would not go well
no, I mean blacksmith's drill bits. Assuming you want to move the hole side ways. If you wanted to enlarge it all round the stepped things would almost do that.
NT