I don't know if this is obvious, but I've had good results using sweep to rebuild (refit) curves for those that don't use/have Rhino.
By using the curve to be rebuilt along with a copy of it nearby, joining these two curves with two lines, and using the curves as the profiles in a 2-rail sweep (the lines are the rails) you can choose #points in the profiles dropdown and control how much to simplify the curve. Then just copy+paste the newly created surface lines - it seems to give good results, and the curve is clamped to the end points.