… recently I lamented, that there are no visible and parametric snap points in the SketcherWB.
But there is a possible workaround when using the tool to convert lines into splines.
Out of them you can compose multiple constrained and closed frames with great variability.
Periodic BSpline has a flaw with the "disoriented" Seedpoint.
A BSpline "closed by constraints" has only one visible seedpoint.
But a composed chain of BSplines has as much points as you like.
It's more complex, but worth experimenting with it.
Edit: Gordon does not like the composed BSpline frame. It must be converted to Approximation_Curve (SmoothingAlgo) .
But with loft it works good and has a lot of seedpoint lines.

- SplineHullFrames.PNG (22.51 KiB) Viewed 1393 times