isnt that a Swallow? (dont follow what you mean by murphy)

in any case, saddle soap etc are made to 'soften' leather...which is what you dont want to do with a saddle where the leather is hung over rails. A horse saddle sits on a solid thing, a brooks saddle sits on nothing, so softening it just means it is going to sag where you dont want it to sag, and stretch and turn into a hammock.
you want the thing to shape to your "sitbones" , hence the dimples, but the rest you dont want sagging and thus putting pressure on your soft bits.

add in perhaps riding it when it was quite wet--this has always been my fear and having to get used to alwyas having a plastic bag with you or cover.

good luck

you could contact Brooks and ask how much it would cost to "re-cover" it, it might be much to expensive to ship it, have them do it etc...who knows.
At this point, wouldnt you prefer to have a less "fussy" seat that you dont have to worry about? There are lots of good seats out there.