I have a similar idea but I spoke with IDFG today on the telephone and I'm coming from out of state. I asked about tags for the following units (4, 4A, 6, 7, 9, 10, 12, 14, 15, 16, 16A, 17, 19, 20, 20A, 26, 27, and those portions of Units 21 and 28 within designated wilderness ) because it mentions them on the page I've included here:
https://idfg.idaho.gov/sites/default/files/seasons-rules-big-game-2019-2020-black-bear.pdf
Person said that you can buy the license and then a reduced permit to hunt those areas or purchase the license and the entire state permit. I asked why are those tags are reduced, are there more bear there? Person said, yes. It doesn't look like there is very much access, though, which I'm guessing is part of the pricing and is probably why there are more bear in those units.
It was good to know that unless you want to hunt in a controlled hunt, you can wait right up until a day before you hunt to purchase the license and permit.