I would think that the throttle-kicker solenoid would be needed on BOTH man and auto transmission applications. The compressor load would affect hot base idle speed on both, regardless of the trans behind the engine . . . when, of course, the a/c compressor was working.Mine is, and always has been, an automatic.
I never thought about it, but... a manual may not have that solenoid.
The transmission would normally either be in Neutral or the clutch depressed at idle speed.
It's just one wire coming off the harness. (At the point where power goes to the compressor.)
The solenoid grounds through the carb connection.
It wouldn't be difficult to splice in a wire for that purpose.
You could even run it off the plug for the compressor, rather than tracing it back to the main A/C harness.