Mostly for personal satisfaction, I decided that I must peer inside my iPhone4; due to the proprietary screwhead, I could not. This made my technical side seek a cost-effective way to overcome this unreasonable control from the Big Apple.
I got my lookie-loo at the innards, and it cost US$15 all totaled... next stop will be either the full-on iFixit repair toolkit, or a visit to the local iPhone repair expert.
The only advice I have is this: if you're going to attempt an inside repair on an iPhone, be sure to have plenty of magnification and a clear mind... also, be *-certain-* that Screw A returns to to its Hole A. There are subtle differences to the thread-pitch and length that may not be visually obvious.