Well, I guess I just need to get that Mac Plus/SE/Classic and give it a whirl. I'll look into IP Net Router on the CC to help share the mounted volume from the older Mac.
As for iPhone remote, I have no worries using it. It's simply a fancy web service for Mac OS X. You have to do some port mapping for security, and you set your own password for the service. It's not tied into your admin account (unless you make it the same). The whole thing runs local, the developer is not involved in anything.

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Charlieman will hopefully weigh in on this topic as well. If you didn't check out http://www.vintagemacworld.com/apple_software.html it is a good review as he has been dealing with a lot of the issues JDW raises and more. Personally I think you are going to need what is essentially a 68K software router, that assigns sub-IP addresses to every mounted volume on your system regardless of the source and then provides access to them via a single external global IP address for OS X.

Don't you have to grant the software installer access to your System? Again unverifiable third party company installing networking software on my system. I'll see how it goes for you as I follow your progress with getting the 512K online, before I jump on board that bandwagon. I hope you fins a solution as that would be really cool to get the 512K accessible via the iPhone.