The ecopia should fit on an 8" wheel. That said, I found a set of super cheap tsw wheels on craigslist that are 7.5" with a 215 wide tire so I have not tried it myself. But technically you should be able to.
I just got wheels for my 2019. For some reason they use the skinniest wheel they could on that tire. I think it is for weight as well as needing that width tire for the load rating, anything smaller and the load rating is too low. The ecopia are sl load rating which means they cant take as much...