Both Neil and Brian are correct in their views. I read that Brian is looking at a resolution for the cancellation of GP6, Neil is looking at a rewording of the GP shoot rules so that there is a contingency plan in the event that a GP is cancelled in future.
It's obvious that at this stage of the season, no alternative will satisfy 100% of shooters. The first thing to do is to establish if there is a constitutional need for a rescheduled GP to satisfy the requirements of the GP series. I'd say not.
Next is to establish if there is a desire for a rescheduled GP from enough shooters to make it worthwhile. If there is, a suitable date needs to be established. I think that's where the issue will arise.