One way or another, the script you call will be visible to a ps command.
If, however, you're not worried about the script itself showing up, but the argument list you send to it, then the solution is to use the environment space in the shell.
The first part of the shell script sets the environment arguments, then you call the wrapper script, which then pulls those values out of ENV space.
You'll then see the scriptname showing up on a ps with no args
It's kludgy and nasty, but it'll do the job.
This may not be what you really wanted, but it's a thought.. :)

Cheers,

Malk