Not to be pedantic, but the "low pass" filter when talking about bayer-pattern digital cameras is the AA filter, the one which "blurs", the one which prevents aliasing by attenuating those high-spatial-resolutions which would alias on the Bayer pattern, passing the low, low pass.
A filter over the sensor which blocks lower wavelengths, IR, would be a "high pass", allowing through the higher frequencies of light, the visible spectrum.
I assume there is a second low pass filter, one blocking UV, but that doesn't get talked about much and said role might be accomplished in other ways.
Thanks for the correction, I am the one to blame for the mistake not TaoTeJared :)
I have no clue what the measured WB would be. The shift is so great that I don't think you could change it. I have tried using temperature settings and never got close. All the custom WB does is to shift color in the image and really is better on the computer than camera. I have noticed that the older cameras shift much more than new one's for sure.
Maybe the D7000 is "too smart" for the type of IR photography using external filters. I know my D300 didn't work well with the filters at all either due to the low-pass filter.
Yes, the software engineer at Nikon does not like IR photography :) (Just kidding)
I will try to use my D70s NEF file and convert it to a D7000 NEF file, and see what I get. The only problem is that Nikon guys have encrypted the new way they store the WB on newer NEF files, therefore freeware tools that worked smoothly in the past, now they have problems to deal with it.