Bro, lubrication process is fairly simple. you may use oil/WD40 or grease as per your liking. In my humble opinion, grease is much better than oil because oil eventually migrates leaving the cables bone dry in a couple of days. and, dont worry, take out the speedometer cable doesn't upset any meter related settings.
cant say anything about price of Honda Deluxe's Ignition Coil because I got it (slightly used) from a friend and he kinda gave it to me for free. infact, he was the one who suggested in the first place to change the OEM coil with Honda's coil for better performance.
gave the "Tour-King" a royal bath and scrub today. The experience transitioned from pleasurable to horrible as the exercise proved too much for the old bones.
Anyways.......Lesson Learned: "Leave It to Professionals, Hard Work is Great as Long as Somebody Else is Doing It"