There is hexl-forward-char
which lets me move forward/backward specifying a decimal offset.
And there is also hexl-goto-hex-address
to specify an absolute location using a hexadecimal number.
Is there perhaps also something builtin that lets me move by an hexadecimal offset, or do I need to roll my own here?
hexl-hex-string-to-integer
, so I think you'll have to roll your own.