How to do milk for a cortado at home?

I've recently started really enjoying Cortados, but am struggling with how to do the steam milk at home without wasting milk. Is there a way? Or are these low amount of milk drinks ones that don't lend themselves to one-offs at home?

I know cafes have a high turnover and are able to resuse pitchers, already steamed milk...

I have a standard, 10oz, frother pitcher and don't know how to do less than ~5oz liquid (resulting in around 8oz steamed milk/foam). Which then leaves a lot of milk...

Any insight?