Frame connectors
Stole your pic to show where I welded a peice of 1/2" steel conduit thru.
View attachment 1715560631
Nifty idea, however it's still the bare cable at that point unless you slide a split rubber cover over the bare cable that's inside the tube to protect it. If the tube is welded in at the wrong angle, and you use the parking brake a lot like on a stick shift car, or it just rattles inside the tube against an edge of it, over time it will start to rub through the strands of the cable, and may cause cable failure when you actually need it.
My idea captures the end of the cable housing or sheath in the trans crossmember like it's supposed to be. Its just moved inboard between the framerail and torsion bar putting it in line with the rear underfloor fairlead. Nothing is in this area that will possibly rub through the inner cable causing it to fail. Nothing against your install kendog 170, except mine is simple cleaner install, no additional welding of a tube inside your connector, and hoping you got it all at the right angle. Just add 2 holes in a different spot on the crossmember. I also plan on adding a rubber grommet at the fwd end of the cable to help keep dirt and crap out of the crossmember.
I must confess I was considering running a tube through the subframe connector, then stepped back for a few days while I was coming up with how I was going to do this since i added transition lap plates to the crossmember to transfer the connector loads and covered up the original cable mount hole. Then I got the eureka moment and out came the 6" long drill bit to pilot it, and the 3/4 hole cutter for the front end, and whatever I needed on the other end for the cable retainer clip to fit. I recommend those transition plates only because your subframe connector may be thicker steel, and it needs a transition to that thinner crossmember to transition the load.
