Your ULF will support multiple languages already although I'm not sure if Dutch is supported - others will know. I've coded my Nav to support GB, US and ES. Switching between these changes the Nav menus, voices and changes the VR to talk in UK or American English, or Spanish and to recognise me talking in English or Spanish. I can switch language for VR in the normal way through the nav set option. New VR language works after turning ignition off and on.

If you don't have Prof Nav, you could still use Navcoder to re-code a default language - this should change the vehicle language coding and the ULF VR default. A dealer can also do this very easily. However, if Dutch isn't supported in the ULF you could code the entire car for English - clocks etc. VR in English is still KM and Metres, so not too bad.

I'm not sure a SES plug is needed - these were for early BT systems that had a separate VR (SES) box. Yours is all intregrated in the ULF - MIT SES (with VR).