Atomos - Ninja V+ (ATOMNJVPL2Q)

I would contact Sony and see if there is any such monitor already available and compatible. Swapping out the lcd backlight will be a huge pain in the ass and most likely not work when you are handheld and moving around. There is no shame in needing a daylight viewable monitor. And there is no shame in needing a bigger monitor for handheld work. Honestly the smallhd 502 hd monitor (or cine 5) or the atomos ninja v+ with the sdi input converter would be good if you can spare a sdi or hdmi output on the camera. If you power the camera off of batteries, then you can probably get the dtap power off the battery to power the monitor too. The biggest issue may be splitting the sdi signal out of the camera if you don’t have a spare sdi output, but with battery redundancy on the monitor and camera, you can even loop through the monitor and the engineering truck shouldn’t get too mad at you. The only other small 3.5” monitors I have seen are evf monitors that have a flip up sun hood, but they usually are not daylight viewable as they have the sun hood. But rent some options and see what you like. Even if you pay for it out of pocket, it will make your life so much better for handheld sports work.