you can drill it out or replace it with a suitable brass union joiner. i have the thread specs at home. But seriously, replace it with a 4mm ID line all the way to the slave. there's another section of hardline between the flexy hose and the slave cyl so there's more (potential) restriction there.
On a side note, the stock setup isnt as bad as a lot of performancs oriented cars - eg R56 JCW, RS megane, M3... The R56 is the worst of the 4. The shifter begs you to shift fast but the clutch delay valve makes you look/sound like a noob driving it.
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