Is it possible to set OutputPath in powershell with build macro's?

I found a workaround by changing the csproj via xml

function Set-OutputPathRaw( $projectObj, $outputPath )
{
<#

.SYNOPSIS
Set the output path directly in the csproj file

.PARAMETER projectObj
The project to set

.PARAMETER outputPath
The path to set in the output path. May use dollar-sign macros

#>
    $projectObj.Save() # save beforehand

    $csproj = [xml](Get-Content $projectObj.FullName)

    $nsmgr = New-Object System.Xml.XmlNamespaceManager -ArgumentList $csproj.NameTable
    $nsmgr.AddNamespace('a', 'http://schemas.microsoft.com/developer/msbuild/2003')

    $outputpathnodes = $csproj.SelectNodes('/a:Project/a:PropertyGroup/a:OutputPath/text()',$nsmgr)

    foreach($outputnode in $outputpathnodes)
    {
        $outputnode.Value = $outputPath
    }

    $csproj.Save($projectObj.FullName)
}

Call this via:

Set-OutputPathRaw $project "`$(SolutionRoot)\bin\`$(Configuration)"