This is a partial port of hvdos to the Nim programming language. HVDos (also see here) demonstrates the use of macOS's Hypervisor.framework to load 16-bit DOS executables, and includes partial DOS emulation so that it can run some programs written for MS-DOS. This partial port starts a 16-bit hypervisor but doesn't include any DOS emulation.
You will need a Mac capable of using Hypervisor.framework.
To build and run, nim c --run main.nim <image> where image is a DOS .COM file, or indeed any 16-bit program with an entry point of 0x100.