High level toilet cistern replacement

Yes you can. The flush valve/siphon has to renewed in order to achieve this

Modern toilets will have an internal overflow Flush Valve fitted, which is great as it removes the unsightly overflow pipe and saves drilling a hole in your house for it. But it does mean you need to look out for the signs that your cistern is overfilling. There are only 2 signs this is happening and they are discreet. You will see water constantly trickling on the back of the inside of the pan. This may be very slight or a continuous flow, you may even have a build-up of limescale if it’s been going on for a while. You may hear it. If you have high water pressure and your fill valve is letting in a lot of extra water you may hear the flow of the pipe faintly, but don’t assume it’s not just because you can’t hear the water landing as many fill valves have a silent fill system meaning the water enters from below the water level rather than dropping onto the water surface.