Change Axis used by 'Spline Generation' tool

Hello,

I’ve got a question.

In this picture, you can see that I’m using a spline to make an inclined track at 60 degrees on the Y axis. At the top of that track, I want a semi-circular curve against the degree of incline. The Arc feature of the “generate spline” tool (accessed from right-clicking a spline point) is perfect for this – the only problem is, it seems to only be capable of generating the spline about the Z axis.

To reference the picture again, I want the tool to generate an arc about the Y axis. Is this possible?

Best regards,
Marvis