autoyast installation in Xen DomUs -- defining /etc/fstab ?

I'm setting up autoyast for autoinstall of Xen DomUs.

Both Xen Host & Guests run Opensuse Leap 42.2.

From my Dom0 I pass pre-formatted, but not yet populated, LVMs as disks to the DomU config

	guest.cfg
		...
		disk = [ 'phy:/dev/VG0/EFI,xvda,w','phy:/dev/VG0/ROOT,xvde,w']
		...

I want my Guest /etc/fstab to end up as

	UUID=AAAA-BBBB  /boot/efi  vfat  [ ... efi  fstab options ... ] 0 2
	UUID=111...111  /          ext4  [ ... root fstab options ... ] 1 1
	proc            /proc              proc     defaults            0 0
	sysfs           /sys               sysfs    noauto              0 0
	debugfs         /sys/kernel/debug  debugfs  noauto              0 0
	devpts          /dev/pts           devpts   mode=0620,gid=5     0 0

My question is how 'best' to set the 'proc', 'sysfs', debugfs', 'devpts' mounts & their respective fstopts?

In the autoyast.xml that'll get passed to the xen.cfg, IIUC, I can use <partitioning> for the passed-in devices, with 'initialize', 'create' & 'format' all == "false",

	<partitioning config:type="list">
		<drive>
			<device>/dev/xvda</device>
			<initialize config:type="boolean">false</initialize>
			<partitions config:type="list">
				<partition>
					<create config:type="boolean" >false</create>
					<format config:type="boolean">false</format>
					<mount>/boot/efi</mount>
					<mountby config:type="symbol">uuid</mountby>
					<fstopt>[ ... efi fstab options ... ]</fstopt>
					<size>max</size>
					<filesystem config:type="symbol">vfat</filesystem>
					<partition_nr config:type="integer">1</partition_nr>
				</partition>
			</partitions>
		</drive>
		<drive>
			<device>/dev/xvde</device>
			<initialize config:type="boolean">false</initialize>
			<partitions config:type="list">
				<partition>
					<create config:type="boolean" >false</create>
					<format config:type="boolean">false</format>
					<mount>/</mount>
					<mountby config:type="symbol">uuid</mountby>
					<fstopt>[ ... root fstab options ... ]</fstopt>
					<size>max</size>
					<filesystem config:type="symbol">ext4</filesystem>
					<partition_nr config:type="integer">1</partition_nr>
				</partition>
			</partitions>
		</drive>
	</partitioning>

Where in that case would I set the 'proc', 'sysfs', debugfs', & 'devpts' mounts?  They're not *additional* partitions, and from the docs, for a given partition I can only have one <mount>...</mount>.

One option would be to use a postpartitioning script

	<scripts>
	  <postpartitioning-scripts config:type="list">
	    <script>
		      cat EOF >> /etc/fstab
		        ( ... fstab entries for 'proc', 'sysfs', debugfs', & 'devpts' ... )
		      EOF
	    </script>
	  </postpartitioning-scripts>
	</scripts>

, modifying the just-created-fstab immediately after the <partitioning> step.

That's doable, but seems messy.

What's the recommended way to get to a completely defined fstab in the Xen-DomU-install case above?
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