Moving to France

Hum is caused by earth loops not transformers, unless your cables are not properly shielded. Otherwise, you have no worries.

Some manufacturers have multiple voltage support in their devices.  If that is the case, you are in luck, otherwise....get a transformer and do NOT skimp on it unless you want a fire in your house, get the best (US made, not Chinese).  Get one at least 1.5 times your maximum need.  

https://acupwr.com/pages/voltage-transformers-converters

I once heard that wearing a shirt that has some reference to CA gets one treated in a civil or better fashion.....take one and test...

What part/locale?  If Paris, practice 'driving' with Grand Theft Auto 6...

"The fender you save may be your own (leased vehicle)..." ;)

I was relocated to the Netherlands years back and I sent my VAC amp and ARC LS15 pre amp in to get converted to 220V  Went to France all the time, and even drove in Paris!
You will love it!
Lucky for me my company made up for the difference in the cost of living and l was taxed with the US rate Also my company car and gas card sure helped!! If you know a little French, it goes a long way! Bon Voyage!

Depending on what level of anarchy ensues in November & after -- I myself will be away in a holding zone with France high on the more permanent escape route list -- no major audio equipment coming along for this ride. Dragonfly and powered  speakers will do in the short run. I will never live under a authoritarian dictatorship if there exists some practical and affordable way of avoiding it.

Congrats! I too have a similar plan, love France. I’ve worked there for many years, will eventually skip out to Antibes.