Thank you!
I will investigate how to buy an official copy and patch it with the fan patches.
Even so I really hope that XSEED releases a official translation of both games.
On one hand looking at the sales of Kiseki the Third on SteamSpy, they're lower than CS's sales (surely because the game looks old and is the third entry of the saga), on the other hand they're lately releasing games even more old and niche, so there's hope.
I made a little guide on reddit but here's what I recommend.
The game you can get it from DLsite, you'll need to create a profile so you don't get your credit/debit card denied. I used the following video: https://www.youtube.com/watch?v=BsoEU2sZrSw
Then you'll need a locale emulator to install and play the game. I use the one from pooi.moe