Well, any projection system that projects local map features into true scale with real proportions should be fine.
However, I would recommend to work within the UTM system. It’s a global set of projections, reasonably accurate in all areas (except when close to poles, ie. northern parts of Scandinavia). Then you don’t have to worry about reasearching local projections systems, which are in most of the cases created by national geographic agencies and are specific to each country.
https://en.wikipedia.org/wiki/Universal_Transverse_Mercator_coordinate_system
All the WKT components do is try to get the correct WKT string from spatial-reference.org, so if you’ve found your WKT, just put it in a panel and use it instead of the WKT components.
I’m sorry for the complications.