On the focus rules, they can substitute any item that doesn't have a GP cost. I would argue that the familiarity clause in the spell though reinforces that you basically need to have been at the location your going....scrying in itself is probably not going to cut it.Just because it doesn’t have a gp value doesn’t mean it is substitutable.
A focus can substitute for generic items, but not a unique item, surely?
So I agree with CapnZapp that spells like this should be high level....but then they need to be high level in power to be worth the time...ESPECIALLY if this is going to use concentration.
So something where it lets you find the shortest path AND alerts you to ambushes (aka you can't be surprised) AND gives you a bonus on initiative.....then maybe we are talking something worthy of a 6th level slot.
So in summary....the spell should stay high level (we don't need PCs using these kind of plot twisting spells at low level)....but the spell needs to be buffed to be worthy of such a slot.