Most things can be done electronically, as far as I know there can be more than one Deputy, and one OPG visitor I chatted to at some length a few years ago told me of a Deputy who does the 'job' from Australia and others who live abroad so the system certainly accommodates such circumstances.
A new-ish thing that now appears on the online annual reports us Deputies submit is a question around safeguarding - how often do you see the person, what arrangements are there to make sure they're well looked after etc., so even if you can't visit often you're expected to keep an eye from afar, which is just as it should be.
So it's definitely possible to do things remotely. To be honest, I can't imagine that many panel Deputies (people the Court of Protection appoints if there's no family or friends to step into the role) do much in person. They tend to be professional people, like solicitors, and have a 'day job'.