This would be so cool... I hope it isn't too hard to implement !

Explained here https://qouteall.fun/immptl/wiki/Miscellaneous.html#can-fluid-redstone-and-light-work-across-a-portal

However I am going to design a special block that can convey redstone signal across portal. Making normal redstone cross-portal may greatly hurt server performance.

Awesome, thanks !

Also, if you're thinking to implement something like this, I would suggest that this block would only be possible to place in "mini" areas, and when powered, would power a pre-existing block as if it was hooked to it
For exemple, in this image above, I would hook that block directly to the redstone lamp, because I don't have enough room to place another block on top of the big redstone lamp. This would allow to save a lot of space.
Am I clear ?