Yes, replacing receipts with an Organiser's stamp/sig in the appropriate boxes seems OK to me too. I've done that before now.
As for stapling - well I'm afraid that's something of a rarity.
Most of my Perm riders provide numbered (Proof of Passage) PoP with detail transferred to Brevet Box. I check these, sign in the box (to prove I have accepted PoP) and discard the PoP. To keep PoP beyond here makes it messy as the Cards then go to Validation with SAEs and the bulk costs to post. I am sure JW prefers to receive just Card and SAE and not an additional bundle of paper, stapled or not.
As Perms can start anywhere on route, time of passage may determine a garage/shop closed to some, so alternate forms of PoP are inevitable. Photo evidence works fine (I use this on my Perms when I prove I am on Trike) and a GPS plot is also pretty conclusive. Imagination and ingenuity will prevail! Many riders also explain the origins of their PoP with apologies for nameless and 'wrong time' receipts. I have often used the same outlets, so that will prove their honesty!
A completed 200k/14 hr Perm deserves a Brevet and I will not penalise an 'honest' attempt to provide PoP.
SteveP