Hi Michael.
"Putting in a blend curve as a transition between them could work or another possibility would be to edit the first interior control point of the helix to make it in line with the 2D line."

I have not been able to make a fillet curve that functions.
Could you post how it can be done

Thanks

I have made a video with a solution that works respecting the radios.
If there is another easier solution, I would like to know the process.

Cheers