Unless you're very lucky, the answer will be no. I bought an "imperfect" Aayla from a retailer (the lightsaber didn't work). Knowing all these problems - and fixes - I decided to buy it as it was a bargain price. Sadly, the reason the lightsaber didn't work is because it was snapped internally in two places.
I also dropped Sideshow an email to see if I could actually buy a replacement (not exchange or refund). The reply was...confusing. They never seemed to acknowledge I had asked them a direct question and suggested that I returned it to the retailer.
Bit gutted but at least I can still display Aayla without any noticable breakages. Still hoping someone has a spare and looks on the WTB board.