Thanks curaga, Rich, juanito. I clearly must have done something wrong when I tried creating the symlinks, above. All working now!
EDIT: If you're going to go down this path, you'll also need:
bash.tcz
create a system group called 'daemon'
create a 2 system users: 'mysql' and 'daemon'
create the link suggested above (/lib64 -> /lib)
Then run the installer with sudo. As an alternative to manually creating the users, create a couple of scripts (useradd & groupadd) that pass their args to busybox. You'll need to change '-r' parameter to '-S' for the busybox utils, though.