Two other ideas:

You could create an "original" copy of the VM that you never touch,
and then clone it to restore. What I don't know is whether clone
implies duplicating all the storage too. If so then you might want the
original to have no file set for the virtual drive.

I've gotten somewhat adept at fiddling with the xml using 'virsh edit
$vm' but there's a somewhat recent feature you can enable in
virt-manager to directly edit xml in virt-manager. For every device on
the left side UI, there's GUI configuration on the right side, but at
the top there's a tab to see the xml. You have to go dig in
virt-manager preferences to enable xml editing, otherwise you just get
to look at the xml, not change it. I've started doing this rather than
editing the xml directly via virsh edit.

--
Chris Murphy
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