In pursuit of 32-bit => 64-bit upgrade path

I've been conducting some trials to get a system on 32-bit Fedora to 
upgrade to 64-bit Fedora.  Nothing so far has succeeded.  Yum always 
ends up with hundreds of conflicts.  I think what is missing is that 
first we need to be able to run a 64-bit kernel with the 32-bit userland 
and then maybe we could get some traction on an upgrade path between the 
architectures.  Then 'uname' would report a 64-bit capable system and 
/etc/rpm/platform could have x86_64-redhat-linux and together those 
might straighten out yum to where it could determine proper dependencies 
with 64-bit as preferred.

Is it possible to run a 64-bit kernel with F10?  Is there a set of 
packages that could be force installed that would allow this?

Regards,
Gerry