If your bog oak log is one of those thousands of years old treasures, I believe the first thing you should do is put in storage out of sight. It may be extremely valuable. As for drying, you have a unique situation with that. My thought is to have it milled into 2 - 2 1/2" slabs of lengths you can handle. Then stack and sticker. (stack with something in between to allow for air flow) Put into dry storage, seal ends and wait. I use an old house fan to keep air moving. But, where you live, this time of year, that may not help much. In warmer weather the fan is a big plus. For pens, maybe cut some 6" lengths, mill into blanks and stack in the house and wait, and wait.
Send us updates, you have something special there.