Got the control cable feedthrough gland put in and attached the MOV block to the entrance ground and the control cable pulled through and hooked up.
Only big downside is that it's direct-burial telecom cable, and that stuff has silicone grease throughout as a moisture barrier/displacement. Godawful stuff (better than the blue drippy goo that used to be in direct-burial TV coax, that stuff is VILE), but removable with isopropyl and a paper towel.
Tomorrow I'll get the manual tuner trigger together and see what happens with applying some RF to the cable!