Aubergine beat me to the bottom load rear caliper picture. My Revel has rear brake cable stop on the NDS top tube, about the same positioning as the frame in the op. The braking was just ok with all the looping involved getting from the stop to the caliper cable mount. And, just ok due to it being the rear brake. I solved the issue by simply mounting the caliper inside of the rear caliper, on the brake bridge. I also used full length housing with cable ties on the driveside top tube. Now the cable/housing to the derailleur has a minimal loop to get to the caliper.. The braking is vastly improved.
I am rehabbing a total reverse shoulder replacement, 7/24/2025, right shoulder. Hence, I have the Revel on an indoor trainer, I can dismount using the step through while holding the handlebar with my left hand. It eliminates the right from the process.
I think I would likely not like the center pull caliper with cable and housing running down the center of the top tubes. I like having the top tube for a bottle mount and/or top tube bags.It is all in easy reach.