AddBootOptionNoHyperV/AddBootOptionNoHyperV.ps1

# AddBootOptionNoHyperV.ps1
# Create a boot option with Hyper-V turned off

# Variables
$description = "Windows 10 Pro -"

# Before doing anything, check if the boot option already exists
$already_added = bcdedit /enum | Select-String "VirtualBox"

If("$already_added" -ne "") {
    Write-Host "VirtualBox boot entry already added -- bailing out"
    Exit
}

# First, rename the current boot option to "[...] - Hyper V"
bcdedit /set "{current}" description "$description Hyper-V"

# Create a copy of the current boot option
bcdedit /copy "{current}" /d "$description VirtualBox"

# Get the name of the new boot option (assumed to be the last one
# listed by `bcdedit /enum`)
$vboxboot_guid = bcdedit /enum `
    | Select-String "description" -Context 3,0 `
    | % { $_.Context.PreContext[0] -replace '^identifier +'} `
    | Select -Last 1

# Turn off the hypervisor for the new boot entry
bcdedit /set "$vboxboot_guid" hypervisorlaunchtype off

# Make VirtualBox the default boot entry
bcdedit /default "$vboxboot_guid"