I use Macrium Reflect image backup software which can create a Bootable Flash/CD using WinPE, which is a severely stripped down version of Windows Vista/7
On my 64 bit hardware 64 bit Macrium will by default create a 64 bit WinPE which has little support for any 32 bit applications.
64 bit WinPE obviously behave like 64 bit Windows, so any 32 bit applications that need Windows\System32\ executable's will instead be directed to Windows\SysWOW64\
BUT none of that is needed for 64 bit Macrium Bootable Application code so I guess SYSWOW64 has all code stripped out.
If I had 32 bit Macrium then by default it would have created a 32 bit WinPE.
I actually downloaded a 2 G Byte of WAIK from Microsoft and Macrium had a "custom" option which extracted for me a 32 bit WinPE, which almost did all I needed.
Please note that the entire bootable Flash/CD is only 180 MB holding the entire WinPE operating system PLUS Macrium application code.
If I had the time and skill no doubt I could retain sufficient of the 2 G Byte WAIK to do all I needed,
but that would not fit into a bootable CD.
You are partially correct when you say
The "Secure ATA Erase" will always fail under Windows
That is strictly true for any attempt to use any Windows O.S. that is held in the target SSD,
but does not apply if the target SSD is NOT the host of the Windows that is running.
Hence a new SSD may be added to an existing system with Windows running on an HDD,
and when the system boots up into the HDD it is possible to execute the "Secure ATA Erase" of the SSD.
I similarly hoped that 32 bit WinPE would support the tools in the OCZ toolbox, and it supported all 4 tools - but the tool I wanted had a need for a few more Windows executables
My warning to the O.P. remains.
If he has a 64 bit system then any default WinPE that he has available may be trimmed back and not support the essential 32 bit system folders, i.e.
SysWOW64.
Regards
Alan
P.S.
To summarize my experience of WinPE
The minimal default 64 bit WinPE allowed me to attempt a launch of each of the 4 "tools" in the OCZ Toolbox.
I could do so via either a normal GUI select and launch, or via normal CMD.EXE command ;
BUT regardless of how I tried to launch it, WinPE was totally unable to oblige.
The minimal default 32 bit WinPE had no problem with 3 out of 4 tools, they worked perfectly,
only the fourth failed, and the failure might have been due to the SSD needing a firmware update.
The advise given on the OCZ forum was that they expected total failure of the 32 bit Toolbox under a 64 bit WinPE,
and this was a general expectation - not specific to the Macrium Reflect product.