That's great that you have an STL file, which cuts your workload to a quarter or less.

In the isometric view of the part, you have what I believe to be the best orientation for printing. Be sure to turn on the "all supports" option, don't restrict it to "from print bed only" or whatever terminology is used in Cura.

I can't read thickness in the drawing, but if it's not an even multiple of your nozzle diameter, consider to increase the scale to get it close. For example, if the walls are 1.0 mm thick and you have a 0.40 mm nozzle, scale the model up to get 1.20 for wall thickness, 3 lines thick.

If you need only a scale model and not an accurate to-size model, scale it up even more. It's a small enough part that even double size will not take too long, although the support printing will eat up more time than the model portion.

If you use Inventor, Fusion 360 won't take you too far away from your comfort zone, as they are both Autodesk products and F360 is free to hobbyists.

Some makers will consider to tilt the model over to about 30° from vertical, which will increase the number of supports, but provide a bit more bias on the skinny parts, possibly increasing the strength of a very weak model to a merely weak model.