Chit is now live in the wordpress plugin directory (and a slightly better looking landing page here). It's a very small plugin to let you tie download codes to physical products so you can sell physical artifacts in person at markets, and let buyers download a PDF version (or any digital accompaniments) through your existing WooCommerce storefront.
It's a surprising omission - I've really liked the experience with Bandcamp and Itch codes, and was surprised there was no existing solution for WooCommerce. Rich from TooFatLardies mentioned they weren't able to sell bundles either at shows as there was no way to do this. It turns out it's ~150 lines of code.