That's good information, Greg. I'm glad that everything worked out for you in your quest. There are a few things that you'll probably want to verify though:
1. The other phone model numbers in the 830/2830 series were for a different family of ComKey systems, namely the 718, 1434 and 2152. These systems were completely incompatible with the 416 system or phones. They also used a KSU, and a mighty large one at that. The 416 system always used the 9XX/29XX series phones only.
2. An RJ21X is a bridged network interface, providing up to 25 two-wire POTS or similar lines on a punch-down connecting block. It is a common misnomer to refer to a 25 pair "Ampenol-type" connector as an RJ21X, but this is very much incorrect. The same thing applies to the improper use of the term "RJ45". People today believe "if it walks like a duck, quacks like a duck, then it must be a duck". There are literally thousands of wiring patterns that can be accommodated using a 25 pair connector, with USOC RJ21X being one of them.
3. You are correct when you state that the satellite sets don't contain much in the way of electronics with the exception of the amplifier. Mis-wiring CO lines into them on the white/blue obviously won't cause the satellite phones any harm, but back-feeding them into the protected interface circuitry in the primary sets could possibly cause harm to them.
