4k@120hz hue sync concept

I'm looking to get some second opinions on if this would work. I was very excited to find my surround sound AVR has 2 HDMI outputs so I thought I would be able to get around the syncbox bandwidth limitation of 4k@60hz or 1080p@120hz and get a native 4k@120hz with hue sync on my TV.

However, I was a bit naive and didn't realize that the AVR will only process one signal, so despite this 2 output configuration instead of daisy-chaining through the syncbox, the AVR still reads the devices and bottlenecks both signals.

I think this could be solved with a box of some sort (downscaler?) That can take a 4k@120 signal but outputs a syncbox compatible signal like 1080p@120 or 4k@60.

So to the AVR, it looks like you have 2 4k@120hz devices connected removing the bottleneck.

I actually only have a 4k@60hz display, I'm just posting this because it just occurred to me that I think this should work and I know this community is constantly looking for ways to achieve hue sync 4k@120 for gaming.