If you’ve got the training, then for sure, invest in some temp anchors. You can offer it like you said as others walk away from it. Even when providing your quote, make sure the homeowner knows that this involves specialized training and equipment for safety.
If it was me, I’d have three anchor points across that ridge to be able to walk along the edge. One relatively centred and one at each end 10’ in. Double ropes and do everything from on top. Personally I’d be tied from the back d loop harness to keep ropes out of my way. I’d access from the high side with a ladder and levelling leg. Also check if there is a good spot to tie off the ladder. Hopefully the ridge we see can also be used for access to the other side as well. Best of luck on it. Looks like a fun job. Definitely not your average gutter clean.