As of October 4, 2019, you cannot run the Hyper-V Hypervisor at the same time as VirtualBox. In order to toggle between the two, I made Batch files to toggle the Hyper-V HyperVisor on Windows on or off. It is compatible with Windows Subsytem for Linux (WSL). These scripts will need to be run as administrator to be executed properly. They give the option to reset the computer after toggling Hyper-V, which is required for the changes to take full effect.
The enable_HyperV.bat and disable_HyperV.bat files are macros for calling the set_HyperV.bat with their respective arguments, allowing for easy shortcuts on the desktop.
They each call the set_HyperV.bat script by calling Powershell from WSL.
In order to call any file from the WSL command line, use powershell.exe ./set_HyperV.bat enable or powershell.exe ./set_HyperV.bat disable. The respective versions utilizing the macro files are powershell.exe ./enable_HyperV.bat and powershell.exe ./enable_HyperV.bat.
In order to call them from Batch, just run the scripts.