Dolan Pre Cursa / PreCursa / Track Champion

How do I actually get a good chainline with the SRAM S300 (or omniums)?
It's just one axle length size?

With a little luck I could end up with these prices:

€180 Miche Pistard Air (incl. bb)
€170 Miche Pistard 2.0 (incl. bb)
€160 Omniums (incl. bb)
€120 SRAM S300 (incl. bb and Stronglight chainring)
€120 Miche Primato (incl. bb)

But I don't actually think I personally would notice any difference between these cranksets, so if I can stick to €120 that would be nice for my budget.

I messaged Pifko about the chainring, I'll see how that turns out. Maybe I can end up spending €100 or €110 for the S300/Stronglight setup.