A slight angle should not be a problem.. but with wheel steering (in a grampian 26!!??) you'll definitely be getting that sheet in the back of your head at times... is it possible to mount the traveller just ahead of the pedestal? I'm guessing there will be cockpit lockers in the way.
The sheet tackle will be mostly in your way when motoring and standing at the wheel - in which case you could move the traveller to one end... It will still be an awkward reach behind you.