Yes, on the tiller base plate are graduated markings. Think the first graduation marking is 30 deg, but haven't got access to a 330 at the moment to have a look for you, and pics on the 'net and in my course notes are not very clear.
As an Engineer having been involved in this situation, we went out on to the runway and changed the wheels before towing the aircraft. Moving the aircraft with 2 deflated tyres puts a lot of stresses through the bogie and oleo leg, as well as the potential for damaging the runway surface. Not sure what the FCOM/Ops Manual wording actually says, but would think moving the aircraft like this would be a last resort situation. For the sake of 40-60 minutes, can save the operator and the airport a lot of grief.