Do you necessarily need speakers in a DJ console or can you let the sound run on a laptop?
You also do not need a DJ console, you can run everything on your mobile phone.
Can you do it, is just ka * ke
That depends on the "desk". Is it just a MIDI controller? Then the sound comes anyway from the software and the PC.
If it is a standalone DJ system you will need to connect any speakers or headphones. You can then let the signal go into the PC but that would not be a good choice.