You are always welcome at Strathaven!
Seriously, the airfield is always available - no operating hours restrictions and usually someone around if it is flyable. We do have a full-time school here and we do residential courses so there is often someone in the caravan even early hours!
Unlike Bute, you don't need a ferry home.
Next year we should also have a courtesy car and be building an airfield manager's house, so there will be 24/7 occupancy.
But back to main point:
Why not contact your alternate. After all, they might be able to give you some useful info. Then you won't need to worry about PPR etc. They'll half know who you are.
Obviously, if flight safety is a concen, you can land anywhere - ie Cumbernauld before it opens or even Thornhill - even though their planning doesn't allow flights before 9am, to use local examples.
Just don't make a habit of it, or people will question your flight planning abilities ;-)