I tried some projections with optimizing a Fishing-first start, and it is clear to me that it is less efficient. It grows to size 5 one turn earlier than the worker-first version - but it has nothing useful to work with that 5th citizen since the worker hasn't gotten round to mining that hill yet. BW is delayed due to the later access to the gold. All in all the worker-first start produces more hammers and more research, and the slightly faster growth with fishing first is eaten up by the lack of improved tiles.
If someone wants to play out Green start with a worker first, I'm willing to wait with playing. But I really don't think there's any chance that it could be more beneficial than the start I've already shown. So unless I hear some strongly voiced disapproval, I'll go ahead and play some turns, up to 20 if nothing unexpected happens, starting in 30-60 mins or so.