It has been a pain in the neck, but finally, I figured out how to pair my mobile phones with the Kenwood radio and Bluetooth gear that came with the van. In terms of communications, at least the cell phone issue is fixed.
I still have to decide if I want to install a VHF radio already in my possession, or if I should go for a digital hybrid. Further more, there is the option of a really cheap Chinese VHF/UHF radio, that covers everything analog.
Also, I am still struggling if I should keep the vehicle as is, or if I should turn it into an officially recognized camper.