ConvertTo-NormalizedString.ps1

function ConvertTo-NormalizedString {
    <#
    .SYNOPSIS
        Attempts to replace diacritics within a the input string.
    .DESCRIPTION
        Uses String.Normalize to attempt to replace diacritic characters within a string.
    #>

    [CmdletBinding()]
    param (
        # The string to convert.
        [Parameter(ValueFromPipeline)]
        [AllowEmptyString()]
        [String]$String,

        # Allows removal of characters categorised as OtherSymbol.
        [Switch]$RemoveOtherSymbol,
        
        # Remove characters which are not in the ASCII character range after normalization.
        [Switch]$RemoveNonAscii
    )
    
    process {
        $normalizedString = $String.Normalize('FormD').ToCharArray() | Where-Object {
            $category = [System.Globalization.CharUnicodeInfo]::GetUnicodeCategory($_)
            
            $category -ne 'NonSpacingMark' -and 
            (-not $RemoveOtherSymbol -or $category -ne 'OtherSymbol') -and
            (-not $RemoveNonAscii -or [Int]$_ -le 0x7f)
        }
        [String]::new($normalizedString).Normalize('FormC')
    }
}