I've heard of the 'sandwich' style system. I don't think there is any reliable mehod of separating them. It may be a remove and replace operation if you can get the two LP filters standalone. Don't fancy your chances on that. The alternative is a full spectrum mod, remove it all and go with a IR Cut or other filters on the nosepiece.
Mechanically I don't know how the D800 comes to bits.
Would you do a cold finger mod at the same time ?
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