Get ValueFromRemainingArguments/Args as HashTable

getremaining.ps1

function test-remaining {
	[cmdletbinding()]
	param (
		[parameter(ValueFromRemainingArguments)]
		$remaining
	)

	$htRemaining = [ordered]@{}
	$unnamed = [System.Collections.Generic.list[object]]::new()
	$remaining | ForEach-Object {
		if ($_ -match '^-(?<param>[^:]+):?$') {
			# New parameter
			$lastpar = $matches['param']
			$htRemaining[$lastpar] = $true # Default value for switch
		} elseif ($lastpar) {
			# Update value to next argument
			$htRemaining[$lastpar] = $_
			$lastpar = $null
		} else {
			$unnamed.add($_)
		}
	}
	if ($unnamed.count) {$htRemaining['unnamed'] = $unnamed}
	$htRemaining
}

function convert-args {
	$htRemaining = [ordered]@{}
	$unnamed = [System.Collections.Generic.list[object]]::new()
	$args | ForEach-Object {
		if ($_ -match '^-(?<param>[^:]+):?$') {
			# New parameter
			$lastpar = $matches['param']
			$htRemaining[$lastpar] = $true # Default value for switch
		} elseif ($lastpar) {
			# Update value to next argument
			$htRemaining[$lastpar] = $_
			$lastpar = $null
		} else {
			$unnamed.add($_)
		}
	}
	if ($unnamed.count) {$htRemaining['unnamed'] = $unnamed}
	$htRemaining
}