Powershell encoded command variables evaluation before execution (ServiceNow, Invoke-WMIMethod) - powershell

Question

I have an issue with powershell scriptblock executed by ServiceNow MID Server on target host.
Target host is running SQL server where I need to execute some PS Script running SQL commands and post process results (using JDBC activity is not valid in this case).
So I am running powershell on MID server (some kind of proxy, for these who are not familiar with ServiceNow) and I am needed to execute PS script using Encoded command via Invoke-WMIMethod cmdlet (I cannot use Invoke-Command, due to disabled PS remoting - no way to enable that due to company policies) like below:
$Bytes=[System.Text.Encoding]::Unicode.GetBytes($CallArgumentsBlock)
# Command block is passed as encoded command
$EncodedCommand=[Convert]::ToBase64String($Bytes)
$WMIArgs=#{
Class='win32_process'
Name='Create'
ComputerName=$computer
ArgumentList="powershell -EncodedCommand $EncodedCommand"
ErrorAction='SilentlyContinue'
Credential=$cred
}
Invoke-WmiMethod #WMIArgs | Out-Null
Issue is that I need to push into $EncodedCommand pre-evaluated variables. Example of script block:
$CallArgumentsBlock={
Param(
[string] $SQLServer = "$inputSQLServer", #SQL Server Name running on host
[string] $SQLDBName = "$inputSQLDBName", #SQL DB name
[string] $InputData = "$inputInputData", #JSON string holding data processed by PS+SQL
[string] $ResultFolderPath = "$OutputPath_forSQL" #File path where to output results cause WMI can not return output of invoked command
)
$ProcessData = ConvertFrom-JSON -InputObject $InputData
#For each object call sql...
...
*PS code*
...
}
So what should be powershell way to do it?
Does anybody suggest better ServiceNow based solution?
Thanks a lot for your answers!

Answer 1

My initial thought is to remove the Param() statement, and just list the variables and set the values when creating the script block, any reason this wouldn't work?
$CallArgumentsBlock={
[string] $SQLServer = "$inputSQLServer" #SQL Server Name running on host
[string] $SQLDBName = "$inputSQLDBName" #SQL DB name
[string] $InputData = "$inputInputData" #JSON string holding data processed by PS+SQL
[string] $ResultFolderPath = "$OutputPath_forSQL" #File path where to output results cause WMI can not return output of invoked command
$ProcessData = ConvertFrom-JSON -InputObject $InputData
#For each object call sql...
...
*PS code*
...
}