Here's some of the neat stuff:
https://www.aliexpress.com/item/4001070254969.html

^ Interesting alternative to Extron RGB interfaces
https://www.aliexpress.com/item/1005001398880279.html
https://www.aliexpress.com/item/4001280244469.html
https://www.aliexpress.com/item/1005001347043546.html
https://www.aliexpress.com/item/32910242756.html
^ SCART switch that has RGBHV out!
https://www.aliexpress.com/item/4001295252619.html
^ this one is a rip from AxunWork (AxunWorks?)
https://www.aliexpress.com/item/32908897914.html
^ this last one I'm VERY curious about. It's another rip, from "diy918" aka "Sun" on taobao. Some of you may be aware of him, he makes a RGB to S-Video encoder for Genesis/MegaDrive, not unlike those old Micomsoft ones.



Think it's just a modded/chopped n screwed GBS8200 hiding in there? Beats me.
Anyhoo, clearly some of this stuff is some stolen designs, but I am curious where some of them even originated. I've seen that SCART / RCA RGBS image shift PCB available from ArcadeXpress, but haven't a clue who initially released it.
Would love to hear if anyone from here has taken the plunge on some of their stuff, lots of it is quite interesting-looking!