Here is a brilliant idea. Many people who have difficulty sitting down and getting up, as well as those who have the problem of getting in and out of wheelchairs have always had to install rather unstable special chairs on top of their toilets. Here is a toilet riser and a soil stack extension that very simply lift your whole toilet up.
This is far more stable and aesthetic than the raised seats, and allows you to drop that regular toilet back down to the floor when you want to sell the house.
They call it the TOILEVATOR and in Canada you can get it from Hartmobility in Ontario.