Using Honda springs for coil overs

[NoHachi]

You can adjust the rear roll center with a Watts or Wobb link. There isn't much point in doing so, roll centres don't even really exist in the real world, so don't fret to much about them.
If you want less roll, try and find a way to stiffen up the sway bars. I'm sure you could figure out an easy way of making them adjustable.