Adding Milo to breastmilk

Hi! My 8.5mth old doesn’t want to drink frozen breastmilk anymore. He latches most of the time, and only take bottle about 2 days a week when I go to work. He takes in solid well too, and is not on any formula milk. I have tried adding the breastmilk to cerealac and Oats, but he had rejected them. Thinking of adding just a small teaspoon of Milo Gao (no sugar) into the frozen breastmilk and let him drink using by straw. Any mummies done this before? If yes, pls share the outcome/effect. Thanks! P/s. I am aware that it is not recommended to add Milo. But am looking at another alternative besides formula.