No I think you understand me.
however in looking at your question has given me an idea(s) for a Different perhaps Better solution.
Firstly, in Pipe Styles one can control what lines and or hatching is shown In PLAN, and PROFILE.
One can also control the Section Style of the pipe. The confusion is my fault, by including a structure style element, as one can NOT insert a block in a pipe style, one CAN insert a block as a Structure.
The user could insert a structure, that uses a block (ellipse) at the pipe crossing.
OR
The user could create an Interference Style that will place a Circle (I know, not an ellipse) in the Profile View.
I still think the Section View method will produce the desired results with less user input.