Does this exist anywhere? I don't intend on installing the 32bit variation ever. Are the 64 and 32bit versions packaged together out of convenience, or does the 64bit version need some files of the 32bit version for compatibility purposes?
You can make one with the archiso scripts. All you have to do is edit a couple lines towards the bottom of the build.sh to remove i686 (in the for statements).
Otherwise, you can use the bootstrap tarballs that can be found in the same directory as the archiso in any of the mirrors.