The 250k9 model (with fuel injection) already exists in Europe and has done since 2008. If you want one, import one. Like has already been said its not cheap. I think when you look at the cost of a fuel injected ninja 250 you will find you could get something else with FI way cheaper.
FI is necessary in Europe for emissions, as is a 3rd Cat (more cost) in the exhaust system, so the power gain from FI is lost to emissions control.
US market wants a cheap starter bike so carbs make sense, also US emission regs are way softer that European ones, so they can get away with carbs.
Euro market wants a bike that meets license restrictions (25kw/33bhp for 2 years) can't be sold unless it passes emission. I don't think any Carb'd vehicle has passed in the last 10 years.
Is it really that much hassle to use a choke lever? Oh if you do import a euro model we don't have those silly yellow side reflectors so you'll have to sort them yourself.
If I had the option of a €1000 cheaper 250 with carb's I'd take it, but I have to live with expensive Fuel Injection