We had somehow missed this treatment for essential tremor, and thanks to this video expect a family member will be visiting a neurologist or surgeon soon to discuss, for the same reasons you describe. Now available in Australia apparently.
A friend’s mother had this treatment last year (in either Hobart or Melbourne, unsure) and the difference is remarkable. I’ll find out the details. Email me (me @ myHNusername dot com) and I’ll pass them on.