What my brother did to play the European version of Shenmue II for his dreamcast was to buy a Code Replay Game Loader from like Electronics Boutique or somewhere like that. They are usually around 5-10 bucks, and will switch 50hz games to 60hz if they are not burned games, which is perfect since Shenmue II is a pal game. If you somehow found it online, I'm pretty sure it comes with a 50hz/60hz patch so you wouldnt have to worry bout that, but good luck finding a 3CD dreamcast game anymore.
-Chu