Ah, the eternal routing guide questions.

I'm trying to work out if there is a point-to-point season ticket that
would be valid at both Crofton Park and Brockley for journeys to London.

I know the obvious answer is a Travelcard, but I'm specifically
interested in point-to-points - even if from further out.

At the moment I'm thinking Shortlands - London as you could potentially
use it via Brockley changing between Penge stations. Not sure about
validity via Beckenham Junction and Crystal Palace though.

Any advice is appreciated!

Dave