In short, yes.
VW Davenports with 215 X 60 17" tyres will fit your Ocean. There are always a few sets for sale on Ebay usually with only delivery miles. £500 seems to be the going rate. Frankly, I wouldn't pay any more as some VW commercial dealers will sell you a set for this price. These wheels/tyres have usually been removed from a new van on the instructions of the new owner, in favour of something more "Carlos Fandango". Buying a set of these is a good economic move as they are probably cheaper than the new tyres alone. As for the Davonport wheels, IMO they are the best option on a Cali or a van for that matter. They may be boring but they are strong, easy to clean and don't feature any of that diamond turned nonsense that all manufacturers seem to fit these days. Davenports will still look great long after the diamond turned alternatives have been attacked by the dreaded lacquer corrosion worm.
However, there are some things you should know. These 215 tyres are van tyres that usually come as standard on the commercial Transporter models. They are normally made by Continental or Bridgestone are will last a good long time as, I suspect, they are designed with mainly commercial use in mind. They run at high pressure, 60psi from memory, to take the heavy load commercial use and have stronger less supple side walls than some other sizes. Accordingly, some people including me, find they give a harsher and more crashy ride than say the 235's you currently have, especially if your van is lightly loaded. The latter 235 tyres appear to give a more forgiving ride. They don't run at such a high pressure and appear to have a more cushioning side wall construction to assist dampening, thus taking care of some of the harshness of ride.
I have had both tyre sizes and this is my personal experience.