No, I used the wiimote with other Bluetooth stacks as well. But then again, this was 2008+
There have been quite some iterations on the actual device since then.
About the wiimote plus: even though it was intended to provide a better positioning with the extension, it never really had that much impact, so don't expect much but another set of raw (unfused) sensor data. while it was an extension before 2010 nintendo quickly moved the sensor into the actual wiimote by default.
if I remember correctly, those "newer" wiimotes had problems being used, while the older models worked perfectly, with a broad range of bluetooth stacks (including the default windows ones). In the contrib thread there might be an experimental alpha build supporting motion plus, but the actual node is running on wiimotelib v1.7 (i.e. no motion plus).
On that note: the vvvv plugin is based on a hack by Brian Peek, and popularized by Jonny Lee, and was never really intended to be used as a library and rather for experimentations. But since it worked back then, all was good. Nowadays, a quick google lists quite a few potential c# libraries for the same task, that are based on later WiiBrew dev. So that might be an option, if the addonpack node does not want to play nice.
Or simply use TouchOSC on your smartphone.