"While ZLUDA cannot run Nvidia Optix code on Radeon graphics hardware, it can run CUDA binaries without any changes."

Nothing is going to make Nvidia sell their cards at a "reasonable price".  Too many folks are willing to pay $2,000 for a top tier video card.

This is why I have lobbied for dumping Optix and going with the AMD ProRender engine.

The ProRender engine has been integrated into a number of high performance programs like Solidworks, and Plug-ins are available for 3DS Max,  Blender, Maya, and Unreal Engine. 

It will run on any RDNA gpu, so even a $130 RX5700xt from Aliexpress will get you going.

The software is Open Source, and AMD is willing to work with anyone.