Hi,
Previously I had a Windows Mobile 5 device but it is dead now.

Usual mobile devices only supports J2ME.
Also, you will have difficulties finding a Bluetooth stack that will connect the Wiimote.
Long ago there were some projects working on Windows Mobile Bluetooth drivers to connect the Wiimote such as WiiMob but I believe those have been suspended.
You may need to work from scratch for your case. This includes developing the Wiimote Bluetooth connectivity, Wiimote library and whiteboard capability.
Regards,
Boon Jin