If you can do it in an R44, why not an R22? If you can manage to carry enough fuel somehow, and don't mind living in the same clothes for however long it takes - you have no luggage space and after taking essentials and fuel I doubt if you could manage the weight for even a toothbrush. But in my wilder moments I've thought about it vaguely...simply because it's never been done before. I could never afford it though. Someone once said to me that Jennifer Murray hadn't done anything I couldn't do, if I had her money. Very flattering, I've no idea if it's true or not, but I'll never find out, because I never will have her money.
But good luck to her, if she's the one attempting it!