I have just come across a treatment to manage SCA3. It involves retraining nerves and muscles using an electronic suit. It was developed in Switzerland and has agencies worldwide.
Talking with them they say it maintains or improves balance.
It also treat other conditions like spasticity. I has attached details of links to videos to view. Load these details to browser to view.
Louisa's fitting with the Exopulse Mollii Suit to manage her multiple sclerosis related spasticity - Bing video
Exopulse Mollii Suit: Niclas | Ottobock - Bing video
Post | LinkedIn
Mollii Suit - Bing video