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Kimmo
@AlexD
As you say, you will probably need shallower chainring bolts to just use one chainring.
In terms of getting the chainline right, it's just a case of working out what length square taper bottom bracket to buy. Pretty sure DA 7400 cranks use a 112mm length BB.
If you have the chainring on the outside position of the cranks, it will put the chainline at 46mm. Generally a track hub is going to give you a 42mm chainline, so you just need to get a bottom bracket that brings the cranks in by 4mm, which means an axle thats 8mm shorter than the standard 112mm one.
So 106mm. Which I don't think you can get, so 107mm which you can.
I'm pretty sure thats right, but I did the maths in my head and I'm bad at maths, so maybe someone else can back me up :-D