Are there any X570 mobos that supports 16x PCIe + 4x

According to the spec sheet it does supports PCie 1 x PCIe x16 slot Source: Link above

It won't work well but it will work So, what I need is a NVMe x4 passive adapter card, which will plug the into a normal PCIe x1 slot, and

can you use ddr5 in ddr4 slot It won't work well but it will work So, what I need is a NVMe x4 passive adapter card, which will plug the into a normal PCIe x1 slot, and

can you put pcie 1x in 16x slot Again I do understand that 20 lanes of PCIe beats the crap out of 40 lanes of PCIe or even , but that is as long as you got