All you can do is go slower, and hope the oncoming traffic realizes what you are doing. Try yo slow dow whe approaching the intersection so it’s not all so sudden.

There is a left turn lane near where I live where U-turns are explicitly allowed, on a divided road, at a light with a dedicated left turn/u-turn lane and turn arrow. It’s not the cars you behind you you have to worry about, though. It’s the oncoming traffic that would turn right, that has a red light when you are making your U-turn, but they assume you are turning left and can make their right on red (perhaps without stopping like they should).