Hey Dave - have you tried the kind of trousers walkers/climbers often wear?
I wear Craghoppers and Peter Storm ones all the time for casual wear (don't have any denims at all).
They're ideal for you if you like pockets so much - zip ones, at least two hidden ones - in the legs, front, back, sides...plus they're UV resistant, windproof and quick drying.
Other plus? They on;y cost around £30!
Check 'em out at Millets
(No...I'm not on commission..)
D