New 4K TV; how do I best stream audio through older integrated amp

HDMI kind of sucks anyway. Hand off issues etc. I hate the interface, but it is what it is. As others have mentioned, your tv will have digital out, possibly coax rca, but probably Toslink. Easy to do.

On the converter subject, anyone have a good recommendation for a Toslink to coax rca converter? I have Toslink out but need RCA in… 

Thanks all! I went the digital toslink route into the DAC in the Simaudio-Moon, and it sounds great.

A follow up:

So, the TOSLINK protocol supports audio resolutions up to 24/96, but 4K streams at a higher rate, correct? Any way to take advantage?

Also, I have an old Oppo 95. Is it possible to mod that so it can read 4K UHD disks?

Again, thanks!

"but 4K streams at a higher rate, correct? Any way to take advantage?"

Not correct. 4K is a video standard.  24/96 audio will get you there for stereo

unless you want to process Dolby Atmos  or similar protocol, usually via HDMI and a different digital receiver than your Moon.