Three years ago I had two TPAC trips booked; one evening I was browsing these forums and saw a post from DaDaDan. He was giving away two SWUs, much to my surprise, I won them. To this day I still remember DaDaDan's generous offer and I'm grateful that those long flights were much more comfortable than had I sat at the back.
I've never been a Ex Plt member myself, but if I was I'm certain I'd never have use for all 8 SWUs. I'd give them to people instead of letting them go to waste. I'd first contact DaDaDan and ask if he had any use for the SWUs, otherwise I'd give them away via a charity or via FT.