I guess you considered something like this: https://www.aliexpress.com/item/32948192293.html
It's very cheap, although you would have to factor in the cost of mounting it (custom bracket + nuts & bolts).
That exact one I linked might not be suitable as I couldn't find the size of the mounting holes, it might not be a standard and might vary between vendors.
I don't have an X570 but if I had to buy one and watercool it, that's the method I would use. Might be a good idea for an LTT video.