Low height toilet pan

[Droid]

We live in an old cottage with an “Alpine” bathroom floor. The floor falls away from the wall so there is a height difference of 30mm between the back of the WC pan pedestal and the front. This means that the height of the pan rim from the floor at the front is too high. I’ve looked for low height pans, but Google insists on returning results for low level pans which is something different altogether. Are there such things as pans suitable for adults at approx 300mm height? Can you adjust the mounting height of wall hung pans and frames to achieve a lower than normal pan rim height?

I’d appreciate any insight.

Thanks

Drew