Ugh. Caldanese.
Anyway, I never use Napaani and I've never really felt at all excluded. Do keep in mind though that while widely used, it is not PF (AFAIK). Probably because CCP doesn't want to have to go through and make sure no one slipped the Finnish phrase for 'your sister fucks pigs' into the PDF as a formal Napaani greeting.
I've always thought it was a bit like the 'correct' form of the Caldari language. Every speaks forms of it, but unless you received an education of a particular caliber, you probably don't speak 'proper' Napaani. That sort of thing.