According to iGuidance, it's possible but I don't see how it is, and it's impossible to get a hold of someone over there. The installer won't proceed without ActiveSync installed. Help...please!

It is possible. You just need to extract the .cab from the setup files and copy it over to the device, but then you need activesync to copy stuff over to the device. Why not just install AS? You could also, if you have a SD reader, copy the cab file to the card and install from that.