I purchased a spare 1.6NA engine on Facebook Marketplace for parts, but ultimately saved a lot less than I thought I would. Unfortunately, it had been left out in the rain on a wooden pallet, and was completely full of water. I salvaged the cylinder head, intake, exhaust, vacuum pump, and lower timing cover, and scrapped the seized block.
The real prize was this lower timing belt cover, which is surprisingly hard to find and was missing from my engine. I shaved some ribs off the front to improve clearance with the alternator belt, painted the front of the engine block, and reinstalled all the parts.