Creating / Modifying Landscape Spline with PCG

Hi everyone! I was wondering if it’s possible to mocify/create spline data for a landscape spline (either existing or created) from a spline that I have imported into UE. I want to know if it would be possible to make the spline below into a landscape spline for my circuit.

The closest I’ve gotten is to use landscape patches but I don’t feel like that’s the solution.

I liked the capability of the Landscape Spline to non desctructively modify the terrain and also allow to change road type by segment.

Any guidance on this would be much appreciated! Thanks!