I understand. this makes sense ofc.

I thought about a workaround. if it is only for visualization purpose to get a feeling for the curve you could try this ->


open Hypergraph - crate a hightField from the maya general utilities. take a simple ramp texture make it black and white and map the texture into the heightField´s Displacement channel. increase the heightField´s Resolution untill you get a smooth curve. I also set the ramp Interpolation to smooth, but you can play with the settings. you should pretty fast end up with something like this. see pics.

now you can tweak the ramp till your heart´s content. the hightField in viewport shows a direct representation of your b/w rampTexture. it´s no bezier curve I know, but it helps to get a better feeling of the ramp texture.