Well I got it done without getting hurt or actually having to buy anything. After taking a few more good looks I tied my two rapell ropes together and just anchored both ends to the ground on opposite sides of the house and "hung" (meaning walked on the roof with my back to the edge) from whatever end was going over the roofline. Work at the peak I simply sat on the peak and shifted my harness to the left or right. Worked slowly and repositioned a whole bunch and I'm back on the ground with lights along the entire roofline. I probably spent a hour total hanging lights, with 4-5 hours of moving ladders and ropes a few feet at a time, and my back is not happy, though I'll take muscle complaints over fall risks any day. The dang Amazon cyber Monday deal lights look pretty anemic during the daylight but they are up so I'm not changing them now.
I didn't mess around with many pictures, but here's a sweaty, slightly nervous man sitting on the top of his house. The straps were part of my carpenter belt, not safety gear, I wore my saddle with the leg straps tightened, though a real harness would likely have been better.
View attachment 77400
Not sure what the pitch of my roof is but it's steep. Feels like 16/12 or more. That was the main obstacle, combined with the 40+ foot height. Anyhow, glad to be back on the ground. Now for some lunch and to find the back heated mat lol