Document how to disable Soft-RT (or document that it's impossible)

[forderud]

I'm struggling to figure out how to disable the "Soft Real-Time" feature after it have been previously enabled on Win10 LTSC 2021.

Can you please document how to disable the Soft-RT feature, or at least document that it's impossible?

Failed attempts on disabling Soft-RT

I've already tried the following:

$obj = Get-CimInstance -Namespace "root\cimv2\mdm\dmmap" -ClassName "MDM_WindowsIoT_SoftRealTimeProperties01"
$obj.SetRTCores = 0 # zero RT-cores to disable the feature
Set-CimInstance -CimInstance $obj
Set-CimInstance : A general error occurred that is not covered by a more specific error code.
+ Set-CimInstance -CimInstance $obj
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (MDM_WindowsIoT_...FT/WindowsIoT"):CimInstance) [Set-CimInstance], CimExce
   ption
    + FullyQualifiedErrorId : MI RESULT 1,Microsoft.Management.Infrastructure.CimCmdlets.SetCimInstanceCommand

.. and also attempted this:

$obj = Get-CimInstance -Namespace "root\cimv2\mdm\dmmap" -ClassName "MDM_WindowsIoT_SoftRealTimeProperties01"
Remove-CimInstance -InputObject $obj
Remove-CimInstance : The requested operation is not supported.
+ Remove-CimInstance -InputObject $obj
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotImplemented: (MDM_WindowsIoT_...FT/WindowsIoT"):CimInstance) [Remove-CimInstance], Ci
   mException
    + FullyQualifiedErrorId : MI RESULT 7,Microsoft.Management.Infrastructure.CimCmdlets.RemoveCimInstanceCommand

[forderud]

According to https://github.com/amitxv/ReservedCpuSets it's possible to disable Soft-RT by deleting the HKLM\System\CurrentControlSet\Control\Session Manager\kernel\ReservedCpuSets registry key. I'm not found of tinkering with undocumented registry keys so it would be nice if this registry key could either be documented or a wrapper-API could be provided for the same process.