Aizatulin

You can do it with boolean, I've made some experiments combining extrude with boolean and some cleanup operations.

There is a removevertex function. You can store all primitive points or vertices in an array. First you can remove all vertices (or a subset) and after this you can use a modified point list to add them (with addvertex function) again.

Sure

It can be done in VEX aswell (without uv-transfer) using an orientated spline. The uv-coordinates can be extracted from the (xyzdist) captured values.