Boy, you are in a tough spot! It's too bad he doesn't do well with fleece, because then I could think of a thousands suggestions!!
I hate to recommend this (especially in the company of the hyenas! :LOL) but when I had morning sickness real bad and couldn't stand the smell of ANYTHING I used Tushies Disposables. They are real absorbant, but are made with all cotton paper pulp (I think that's what it's called - anyway, no chemicals).
Perhaps during his episodes of heavy wetting they would do well.
Also, something my ped told me to help with potty training - milk is NOT good to give before bed if you are wanting the babe to sleep without wetting (cow's milk that is...not sure about breastmilk in this case). I guess it takes longer for milk to turn to pee, so sometime in the middle of the night all that milk finally turns to pee (so technical, I know! :LOL). So, what you could do is have his last milk be at dinnertime, then only give sips of water. After about 7pm don't give anything to drink.
Good luck with your search!