Stacking rectilinear - transparent prints & sloping sides

I am trying to print a pattern that has to have a transparent bottom, similar to what you would expect for a transparent vase base. I have gotten around this in the past using a .8 print nozzle and just printing a very thick first layer with no subsequent layers but the .8 nozzle isn’t great on precision obviously. Instead I’d like to use a .6 nozzle and make sure that transparent lines are stacked on top each other directly using aligned rectilinear, however, the print has graduating slopes on the side and so the lines aren’t printing directly on top of each other, they are just printing from the edge outwards, which means the lines overlap other lines edges, this reduces the transparency. I’ve tried using the interface shells option and aligned rectilinear, but I can’t get the lines to print directly on top of each other, does anyone know if this is possible? To mimic you can just insert a primitive like a pyramid I guess and try to get the lines to print over each other say starting from the middle, using aligned rectilinear (though in my case this is more like an upside down pyramid which is cuttoff and hollow in the middle). This may require arachne line generation to achieve this I’m not sure. I’m using the latest version of Bambu Studio and my P1S printer is fully up to date firmware wise.

Below are the instructions I’m trying to follow: