A 'fomu' board - an iCE40 that fits within a USB port.
https://object.ceph-waw3.hswaw.net/mastodon-prod/media_attachments/files/115/870/815/736/263/034/original/e241ed38322347c8.png
So what I'd be looking for is closer to one of these Digilent boards (pictured), modernized (eg. with a screen for a modern equivalent of VGA out, maybe HDMI output connected to transceivers) but still super hackable.
What I think doesn't work at all is a super tiny tightly integrated stamp-like board (like the ICEbreaker-bitsy, pictured) or even worse, a fomu (pictured).
The ULX3S comes very close, but it has too much stuff around powersaving and the ESP32, and is missing an LCD.
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