User blog comment:Colgan dog/Is there any other PODs for there to be a republican Britain besides the commonwealth surviving?/@comment-2236231-20181001210429

I can think of a seventh but- it's one that would require other factors to have succeed.

The 1991 Commonwealth of Britain Bill passing into law.

https://en.wikipedia.org/wiki/Commonwealth_of_Britain_Bill

It'd be a more modern pod and thus more easily researched. You'd have to alter events prior to support the bill's passing so there in lies somes challenge.