I think all you have to do is just copy the menu file from TT Go 300 to your 530. I mean the files that belong to the menu you want. You need the TomTom.mnu file in the SdkRegistry folder. That works for me with my Go 730 and its the same as your 530. The name of the SdkRegistry is case sensitive.
What I am not sure of is if it will work on all navcores.