"Machine" is already spelled the way it's pronounced in standard English.
However, if you're looking for a more informal or playful way to spell it, here are some options:
* Mashine (emphasizes the "sh" sound)
* Macheen (emphasizes the "ch" sound)
* Mech-ine (breaks down the word into its component parts)
It's important to remember that these are all informal spellings and wouldn't be appropriate for formal writing.