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Flat bar are a piece of piss, you can easily get a good cheap front one, like this from Bike24 (less than £20);
https://www.bike24.com/1.php?content=8;product=179445;menu=1000,2,15,117;mid%5B931%5D=1;orderby=2
You still need a rotor and adaptor (IS mount to post mount), standard stuff.
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Rotor, 160mm -
Adaptor (if your is IS mount), 160mm front;
https://www.bike24.com/1.php?content=8;product=98373;menu=1000,2,15,117;mid%5B931%5D=1;orderby=2
Place the order anyway.
It's worth the hassle.
Just bear in mind we are talking about Hippy, whom is a little above human!