It's no problem to unlock the demo map and even send it to the GPSr but it will be without street search and routing(?) since those are not included in the demo.

You need either a locked or unlocked contributors map which has the routing and search enabled already. That's why it took so long to even just get this 1.24 from 1.18 version because nobody shared the contributor's version from that timeframe, otherwise we would just unlock the demo every new release without waiting.