And here it is. I released the current version of the #LavaRSC Lite upgrade board.
https://github.com/hkzlab/Lava_RSC_Upgrade_Board
It's mostly SMD, but also decently easy to handsolder.
The version in the repo does not require bodges, but be aware that I'm also working on a smaller revision that uses 0805 components and does away with all the useless stuff that I thought I would use for debugging (but did not actually use).
I think I'll also provide files for factory assembly for the new version, once ready.