One Pager Rendering VHS

Default.html

		<v:page.menu entryLevel="0" levels="1" expandAll="FALSE" as="subpages">
			<f:for each="{subpages}" as="subpage">
				{subpage.uid -> v:variable.register.set(name: 'subpage')}
				<v:render.request action="render" controller="Page" arguments="{page:subpage}" pageUid="{subpage.uid}" extensionName="ExtKey" vendorName="Vendor" />
			</f:for>
		</v:page.menu>

PageController.php

	public function getRecord() {
		// this function is needed to determine the current page. when rendering an one pager layout we need to mock the current page id
		$id = $GLOBALS['TSFE']->id;
		if(isset($GLOBALS['TSFE']->register['subpage'])){
			$id = $GLOBALS['TSFE']->register['subpage'];
		}
		return $this->workspacesAwareRecordService->getSingle($this->fluxTableName, '*', $id);
	}

Hi,
I hope you can help me with this..

I'm quite new to Typo3 and I'm trying to render various pages in a single page, too. I've got different approaches. But I always start with getting the pages via this:
< v:page.menu entryLevel="-1" levels="1" as="sections">
< f:for each="{sections}" as="section" iteration="iteration">
< m:Content pid="{section.uid}" />
< /f:for>
< /v:page.menu >

I'm using a ViewHelper m to render the Content Objects of every page. But I can't figure out how to get the page template rendered with it.

It seems like your solution works including the page template, but I'm not exactly getting how your PageController works. Looks to me like there is an important part missing in the code snippet?
Could you please explain how it works or post some more code?

Thank you so much in advance!