8' in 6" steps is 16 steps. If the tread is around 10" as is common, that's a little over 13'. If you divide the space in half to have 3' wide steps, with a half landing the same width, you only have 12' to play with suggesting that you'd need steps going round the end rather than a half landing. That's not common on a 180 degree bend (but is on a 90 degree bend).
However, 6" risers are rather shallow. Going just over the 7" risers you mention would allow you to make the climb in 14 steps which would work with a half landing the same wish as the steps.
There may be regulations to consider, and obviously you have to make an allowance on the width for banisters, but it should be possible for a competent builder to design something into the space.