Completely enjoying this journey and the creative solutions...particularly liked the Hot Sauce approach. ;-). Thank you for sharing.
@bibilit thank you for the Vanish recommendation. I believe (but could be mistaken) that in the USA/Canada that powder is called Resolve Oxi Action (in-Wash Powder Stain Remover). I am curious what are the main ingredients in your Vanish powder?
They've been on Mac GUI Vault for a few years: Twiggy Mac prototype ROM
I also did some write-ups back in 2014, investigating the file format and ROM:
Twiggy Mac ROM disassembly
Report on Twiggy Mac disks
It isn't necessary to have the adapter. You can merge the contents into a Hi and Lo ROM as used on the production Macintosh board. Some people have already done it a few years ago with the newer Twiggy ROM version.
Thanks for doing this. I can't really understate how much I've gained from all of the materials the community has shared on outlets like Bitsavers, Macintosh Garden, the Internet Archive, and so on. I always try to pay it forward with stuff from my own collection.