I still do not understand if you just want to "replace" a category or you want to completely change the EU + sequence.....

To replace even one category you need to edit the speedcam.zip file to see its icon in the menus and on the map. Here I explained a little how to do:

[Only registered and activated users can see links. ]

But if you do not know how to use Illustrator it's impossible to do it.

After the simplest thing is to "trick" both the Dictionary.voice file and the Dictionary.lang.

Spoiler: example
Dictionary:voice

;[speedcam_category:10]; nel txt banca dati=10
Town entry point ahead.="Fine della zona tutor."
Town Entry Point="Fine della zona tutor."
Town Entry Point."Fine della zona tutor."

Dictionary.lang

Town Entry Point="Fine della Zona Tutor"