S8: Select output device for audio?

With the S8 of my mother is a part of the jack plug of the headphones while they were in the phone were broken and stuck in the 3.5 mm plug in it. In a few days she will replace the plug to get the part out of it, but unfortunately it is not possible for her to play media through the phone's speakers and can only talk through speakers because the device still considers the part of the headphones to be correct Detects headphones and tries to play the audio through it. My question now is whether there's a possibility (out of Bluetooth headset), e.g. Youtube on the speakers of the phone to play, perhaps through a (manufacturer) App to select the input and output device, such as the laptop.

Try the App SoundAbout.

Helped, thank you.