Removing Network Adapters from Powered On VM's

I wanted to remove Network Adapters from multiple VM's, so I thought a simple script would do it:

Get-NetworkAdapter -vm test* | ?{$_.NetworkName -like "dummy"} |Remove-NetworkAdapter

But this only results in error because the VM is powered on:

Remove-NetworkAdapter : 2013-08-13 15:58:48    Remove-NetworkAdapter        The

VM must be in the following state: PoweredOff.

Is it possible to get around this?

Since this is possible through the vSphere Client it gave me the chance to try out Onyx. Below is the result from Onyx:

$spec = New-Object VMware.Vim.VirtualMachineConfigSpec
$spec.changeVersion = "2013-08-14T07:04:15.86208Z"
$spec.deviceChange = New-Object VMware.Vim.VirtualDeviceConfigSpec[] (1)
$spec.deviceChange[0] = New-Object VMware.Vim.VirtualDeviceConfigSpec
$spec.deviceChange[0].operation = "remove"
$spec.deviceChange[0].device = New-Object VMware.Vim.VirtualVmxnet3
$spec.deviceChange[0].device.key = 4000
$spec.deviceChange[0].device.deviceInfo = New-Object VMware.Vim.Description
$spec.deviceChange[0].device.deviceInfo.label = "Network adapter 1"
$spec.deviceChange[0].device.deviceInfo.summary = "dummy"
$spec.deviceChange[0].device.backing = New-Object VMware.Vim.VirtualEthernetCardNetworkBackingInfo
$spec.deviceChange[0].device.backing.deviceName = "dummy"
$spec.deviceChange[0].device.backing.useAutoDetect = $false
$spec.deviceChange[0].device.backing.inPassthroughMode = $false
$spec.deviceChange[0].device.connectable = New-Object VMware.Vim.VirtualDeviceConnectInfo
$spec.deviceChange[0].device.connectable.startConnected = $true
$spec.deviceChange[0].device.connectable.allowGuestControl = $false
$spec.deviceChange[0].device.connectable.connected = $true
$spec.deviceChange[0].device.connectable.status = "ok"
$spec.deviceChange[0].device.controllerKey = 100
$spec.deviceChange[0].device.unitNumber = 7
$spec.deviceChange[0].device.addressType = "assigned"
$spec.deviceChange[0].device.macAddress = "00:50:56:8f:74:52"
$spec.deviceChange[0].device.wakeOnLanEnabled = $false
$_this = Get-View -Id 'VirtualMachine-vm-646'
$_this.ReconfigVM_Task($spec)

After stripping this down a bit I were left with:

$spec = New-Object VMware.Vim.VirtualMachineConfigSpec
$spec.deviceChange = New-Object VMware.Vim.VirtualDeviceConfigSpec[] (1)
$spec.deviceChange[0] = New-Object VMware.Vim.VirtualDeviceConfigSpec
$spec.deviceChange[0].operation = "remove"
$spec.deviceChange[0].device = New-Object VMware.Vim.VirtualVmxnet3
$spec.deviceChange[0].device.key = 4000
$spec.deviceChange[0].device.deviceInfo = New-Object VMware.Vim.Description
$spec.deviceChange[0].device.deviceInfo.label = "Network adapter 1"
$spec.deviceChange[0].device.deviceInfo.summary = "dummy"
$_this = Get-View -Id 'VirtualMachine-vm-646'
$_this.ReconfigVM_Task($spec)

Running this doesn't give any errors, but still all Network Adapters remain.

Is there any easy/better way to script this?