request: working ascii2hex and hex2ascii function

the solution with the registry plugin is not working proper
${Registry::StrToHex}
${Registry::HexToStr}

various manipulations results in value '6' instead '6F'
using intop with offset results in 111 when i add 69.
11 ist totally wrong. and intfmt ist the wrong function.
i dont want to build an array for that, pls help.

ok i did it better with

(back with intfmt)
not perfect but working w/o any correction.