PowerShell Advanced functions are difficult to properly pipe - function

Question

I can't get my head around the piping thing. I've read through the Get-Help and in Jon Dones his examples but I can't understand it properly. So I started playing with a function I found online to execute a script block in a specific culture (regional settings).
I managed to have it process these arguments correctly:
Use-Culture de-DE {Get-Date}, {Get-TimeStamp}
Use-Culture nl-BE {Get-Date}, {Get-TimeStamp}
But when I try to pipe to Use-Culture, it's just not working at all:
de-DE {Get-Date}, {Get-TimeStamp} | Use-Culture
nl-BE {Get-Date} | Use-Culture
I feel like I'm missing the basic concept here. There was another question on StackOverlfow talking about this topic. One guy said to use Foreachand someone else said to work with -Inputobject. Then again, Don Jones used in his Advanced Function no such thing and stated that the Process block gets iterated for each object.
What is best practice to pipe multiple arguments to a function? In this case, multiple Script blocks to execute against the same Culture.
Thank you for your help as always.
Function Use-Culture {
param(
[Parameter(
Mandatory=$true,Position=0,
ValueFromPipeline=$true,
ValueFromPipelineByPropertyName=$true)]
[System.Globalization.CultureInfo]$culture,
[Parameter(
Mandatory=$true,Position=1,
ValueFromPipeline=$true,
ValueFromPipelineByPropertyName=$true)]
[ScriptBlock[]]$code
)
process {
ForEach ($_ in $code) {
trap {
[System.Threading.Thread]::CurrentThread.CurrentCulture = $currentCulture
}
$currentCulture = [System.Threading.Thread]::CurrentThread.CurrentCulture
[System.Threading.Thread]::CurrentThread.CurrentCulture = $culture
Invoke-Command $_
[System.Threading.Thread]::CurrentThread.CurrentCulture = $currentCulture
}
}
}