First of all Diawara and Berge are not coming. Berge is reasonable but there's no indication he's ready to play top level football as a starter for us next year and Diawara would be like 50m. And I don't even think Diawara, Winks and Berge could all play together, just a really bad fit.Why not?
New DMIs a perfectly fine diamond. You'd have someone who can screen a defence, take the ball under pressure, turn and move it forward (Berge) and you'd have the runner next to Winks who would be the runner in the midfield (Diawara) whilst Dele is at the tip creating shit.
New CM - Winks
But with a diamond you not only need extremely good wing backs to provide width, it's also really easy to counter which is why teams only use it when they play vs narrow 433 formations.
The diamond can be used really well as we've seen with Liverpool and sometimes us and Man Utd, but it can not be relied upon every game across a whole season.