But I want, with standard enumeration, a changed bit position.
For example.
We have map. 0->5, 1->2, 2->3, 3->7, 4->4, 5->6, 6->0, 7->1
This means that the bit at the zero position puts on the fifth, the bit on the first position puts at the second position, the third bit at the seventh, etc.
Given these permutations, we get the following numbers.

Old Hex   7 6 5 4 3 2 1 0   NewHex          (Position)
00        0 0 0 0 0 0 0 0   (00)
01        0 0 1 0 0 0 0 0   (20)
02        0 0 0 0 0 1 0 0   (04)
03        0 0 1 0 0 1 0 0   (24)
04        0 0 0 0 1 0 0 0   (08)
05        0 0 1 0 1 0 0 0   (28)
06        0 0 0 0 1 1 0 0   (0C)
07        0 0 1 0 1 1 0 0   (2C)
          3 5 0 4 2 1 7 6   (old position)