Well a double-cake stop is fine for sure but I think you're right and a purer 'loop' route makes sense. You could easily do the Krong rather than Aston Hill. It lacks the easier Wendover Woods option for sure but it'd be much quieter (avoiding that main road towards Halton) and the top of the Krong is more fun (for certain values of the word 'fun'). :-) As you know personally I'd rather we climbed the Hale rather than Aston or Krong but I'm very aware it is rather evil towards the top, I'd rate it about number 4 in the Chilterns. Shorter than Kop Hill and not as bad as Smalldean or Grey's but better/worse than Whiteleaf. Whichever route we take it'll be fun.