When I swapped over to a 620 engine from the 600, we converted the SS tank at the same time - I guess it's the same process more or less!
We found that a Triumph FI pump is exactly the same as the Ducati one, and that this also fitted in place of the standard carby pump. You just swap them out.
The pressure regulator is built into the throttle bodies, so this was not something we needed to worry about, but if you want one then again the Triumph one was the same 3bar as the Ducati ones.
There were a whole load of cheap Triumph FI pumps on ebay, and their setup includes pump, regulator and a fuel filter that is exactly the same as the Ducati one too!
eg:
http://www.ebay.co.uk/itm/TRIUMPH-SPRINT-RS-955i-51-reg-2002-PETROL-FUEL-PUMP-/330624658629?pt=UK_Motorcycle_Parts&hash=item4cfac 3ecc5