Launch command-line utility from DUA without showing a CMD.EXE win

Question

Various things needed done during a DUA update script have called for running a console mode .exe (for example, a vendor-supplied BIOS update program).

Our Minlogon XPe image uses a custom app as the shell, so does not have explorer or cmd.exe running.  The image boots via a script configured to run for userinit, and it manages whether or not the system boots into the application based on if a DUA update is in progress or not... amongst other things.  It works great, except I have issues with DUA running things.

It seems frequently necessary to use DUA EXECUTEPROCESS to launch cmd.exe, and supply arguments to it that launch a console app because it will not work otherwise.  That puts up a DOS box window... not something I like at all though on the unit all keys you could use to mess with the system are 
disabled (Ctrl/Alt,SysReq,Break, etc).

I've tried using vbscripts (WshShell.Run/Exec methods), but still seem to need to use cmd.exe to launch cscript or wscript.  Color me stymied.

Does anyone have any thoughts about how to get DUA to run stuff without popping up a console window that screams "C:\WINDOWS\system32\cmd.exe" in the title bar?  Is there a way to make DUA run cmd.exe full-screen with no frame?