We have family abroad, and they (and we) tend to travel a lot.
I have not personally used Wise yet- but my Sister-in-Law/Brother-in-law love it, and recommended it to us for ease of use in actually spending in multiple currencies while traveling.
They haven't used it for the purpose that you describe, but they have been very happy with it's ease of use and flexibility.
When they suggested it to is, I really didn't consider it, as we have other options we have long used for getting local currency when needed (for transfers there are a couple of services I have used, and for local currency ATM's work fine) so I wasn't really sure what the benefit would be.
Interesting idea...