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slate roof replacement and insulation

In a couple of months, we will be replacing the slate roof of our 1932 Dutch Colonial in the DC area. There is no access anywhere to the attic/crawlspace, and I don't believe there is any insulation up there. It occurred to us that while the whole roof is "off" that it might make sense to put some insulation up there, blown or otherwise. We asked for quotes for insulation when we solicited proposals for the slate roof. The responses were all over the place, and we are trying to sort out what makes sense, or if there is even an advantage to doing this while the roof is being done-- rather than trying to cut holes in the ceiling and do it that way. The bid that seemed the most senseible was to install blown fiberglass insulation R-38, but it talks about removing 2 24"x15" areas of wood for the workers to "drop down into attic areas." (!) First, given we cannot and do not use, and never expect to use, this attic crawlspace, what kind of insulation makes sense? And what special provision should we make to ensure we do not suffer from condensation, etc.?
Thank you, Laurel

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