For `GNU dd(coreutils) 9.1`, you can directly use `B` suffix to skip bytes rather than blocks.
```
skip=N (or iseek=N) skip N ibs-sized input blocks

N and BYTES may be followed by the following multiplicative suffixes: c=1, w=2, b=512, 
kB=1000, K=1024, MB=1000*1000, M=1024*1024, xM=M, GB=1000*1000*1000, G=1024*1024*1024, 
and so on for T, P, E, Z, Y. Binary prefixes can be used, too: KiB=K, MiB=M, and so on. 
If N ends in 'B', it counts bytes not blocks.
```