Welcome to the community Olivio!
I know of one person who has done something like this with a PhD through the Open University doctoral program. In this case, he was registered at the OU, had a Marie-Curie fellowship for funding, worked mainly at a research lab in Naples and also made several long research visits to other labs. I think he had a supervisor in OU, Naples and one external lab. He moved around a lot, although I wouldn’t necessarily call him a free-spirited nomad as his research was in marine biology and the trips were planned to access animals from different regions.
Personally, I spent several months visiting a lab in Sweden while doing my PhD at the University of Queensland, which they funded through Graduate School International Travel Award program. I think this kind of lab visit is generally encouraged for science PhD students as I know of students from various countries doing similar things.
Coming from a science background, I wouldn’t expect to do a large part of a PhD program remotely unless it was required for something like field-work. Even if doing a project (say computational modelling) that could be done remotely, my expectation is that most science supervisors would expect their students to be present in the lab most of the time.
Of course, things have changed a lot of with COVID travel restrictions and social distancing, so if your project does not require you to be physically present then supervisors may be more likely to approve of virtual work (and I expect many experimental labs are thinking of ways to do more remotely now as well). I’m not really sure how to bring this up in an interview, but maybe you could suggest the option of remote work as something you’re pro-actively considering and planning for in order to minimize disruptions to your study caused by on-going/future restrictions.