Kudos to user "Fit" for finding this!
There's an outfit in Malaysia called MaxAudio that sells a Works Engineering crank pulley for the 3A92!
Listed price is $90 (regular price $139 if that matters), DHL shipping to US is $25. If you use the discount code MAX-NEW-10 you can get a 10% discount. This brings the total shipped price to $106. I think that's a very reasonable price, and thus I ordered one.
Works Crankshaft Pulley for 3A92
Their website is a little wonky and slow, be patient with it.
I'll keep y'all posted on shipping progress, and the fun stuff when it arrives.