BSD is a very permissive license and as such should not pose any problems. In fact the Open Source license usually only really matters for reuse libraries. This being a tool it is of less concern, even GPL (with a small exclusion clause that the SW may also be used within the closed source LabVIEW application) would work as all it disallows is to use the SW library for derivative works without releasing the entire source code of said derivative work. As a plugin for LabVIEW with aformentioned exclusion clause there is not really much you would take away from potential tinkerers with your tool/plugin.
That said I usually use nowadays BSD for anything I want to make available as Open Source since it is the most simple license IMO. GPL and LGPL are about umtien pages of text now, that even lawyers disagree about what it all means