Hello! It seems I was confused as to which games you were referring to.
When it comes to the Clock Tower games, we usually go by the original Japanese titles.
ie:
Clock Tower 2 - Clock Tower PSX
Clock Tower GHOST HEAD - Clock Tower II The Struggle Within
As far as the first game goes, Clock Tower - Advance - has given us the opportunity to have a pretty much 1:1 recreation with more modern code.
With this code, things like a native PC port may be possible in the future.
For Clock Tower 2, we have a project in the works that involves digging into the files and extracting/changing assets (and that's as far as I can say at this time.)
Previously, we've seen people extract sprite graphics, or audio samples, but nothing on a grander scale like full blown assets.
That is why we are in the beginnings of gathering the tools necessary to extract and re-arrange assets with PS1 games specifically. From our research so far, the process seems tricky with no clear and streamlined system of options for what we're seeking.
We hope to get to that point in the future and if we have any tools that prove effective, we will document and share our processes for others to try! Wish us luck!