I have never tried ether substitutes, but I do know that using Petroleum Ether, rather than Ethyl Ether will result in an opaque film. Not good.

It is possible, at least according to John Coffer, to use denatured alcohol in place of both Ethyl Ether and Ethyl Alcohol. Your "set" time for the collodion will be much longer, but it should work.

Again, you will get better answers at the other forums. There are only three or four of us here, and there is at least one Canadian who participates in the other forums.