Lots of routes I fly in Europe e.g UK to Canaries or over Austria/N Italy where there is a lot of traffic there are often high level clouds caused by so many planes making persistent contrails. A way of reducing these would definitely be beneficial from a climate perspective.
Operational challenges: given most flights I fly we go as high as possible for efficiency generally. Flying higher isn't normally an option, flying lower will generally increase fuel burn. Which may be of more climate benefit if it prevents enduring contrails despite higher CO2.
But then you'd either need to carry more fuel all the time = higher fuel burn or just on some flights when it's possible.
Looking at a rear facing camera and adjusting sounds nice but isn't too realistic.
Disclaimer yes I know that relative headwind/tailwind can sometimes exceed benefit of climbing.