Support issues - HELP!

[curious aardvark]

well I'd switch from cura to prusaslicer - I know there's an option to manually place supports on that - plus it's just better :-)

As far as cad goes - I pretty much only design practical things, so openscad is all I use.

For things like artistic modelling, blender is good - albeit a total bastard to get good with - though I'm sure there are millions of how-to videos on youtube.

If you design your own models - then incorporate the supports into the model. That way you have full control over the size and shape.
On the very rare occasions I use an occasional support - I leave about 0.15mm gap between the top of the support and the bottom of the bit supported. Makes it easier to remove and leaves an area really easy to sand flat.

The little battery powered ngravers have a ball shaped end with diamond dust. Good for general purpose shaping as well as enlarging slightly small holes.

I find that the more powerful dremel type tools - just won't turn down slow enough. So they tesn to melt the plastic, rather than filing/sanding it.

Sculptris is also worth a look. Free and pretty easy to use. https://www.sculpteo.com/en/glossary...is-definition/
https://www.youtube.com/results?search_query=sculptris