boot the 32 bit kernel on a 64 bit PPC Linux machine?

Hi all,

I'm looking to cover a corner case for an upcoming test cycle. Is there a way to boot a RedHat Advanced Server 4 (update 3) installed on a Power PC machine to use a 32 bit kernel? This would be similar to what is done here -> AIX platform

I've done some pretty major Googling, but so far I have come up dry. Any ideas? Thanks in advance!