Fuse 22 under the hood is hot in RUN and START, along with 16, 18, 23, 29, 26, 53, 54, 20, 27, 54, and 28. AC compressor fuse 30 feeds the relay contact, but it's on the battery side, and is always powered up. What you need is on the compressor side of the relay going down to the clutch, if you need a high-going signal for compressor ON. That's connector C1, pin E12 for the 4.2, C1, D11 for the 5.3. If you need a LOW-going control signal for the AC, then pick the control signal going from the PCM to the relay coil, C2, F12 (4.2) or C1, D9, (5.3)C2, B6 is indeed the output of fuse 22. Fuse 30 is on the wrong side of the coil for what you need. You might pick it up easier at the relay blade. Pull the relay, wrap a thin wire around the blade, then plug it back in. If an engineer says it's OK, it's not ghetto.
Although you should know I have had unsatisfactory experiences with an efan experiment in hot offroad conditions, and am not an enthusiast of the HP-savings claims.