I think it would be wishful thinking. I'd be into it just like you would, first in line to grab something really cool. But it seems like an uphill battle just getting the word out about their figure releases, let alone a set of accessories for those figures. I'm not sure they'd have enough draw for stores to carry them, nor enough sales for Threezero to make them to only sell from their own store. The fact all kinds of people and companies are making customs and unlicensed stuff at rock-bottom prices, even if some of it's crap, probably puts another wet blanket on the idea.
Wolf King has a new unlicensed figure set they're debuting packed with stuff including an unfortunately scaled barrel, then there's Eleven and OneSixthKit selling some random accessories.
I saw that. Hoping I can find a barrel on ebay. I also bought some custom containers with the crystal blue inside them.