I have run a filter out to the normal interval but changed the oil half way on many occasions.
The Pathfinder has a recommended OCI of 18k and i tend to change at 5/6k, though this year i left it longer as it was nearer 10k.
I have done the same thing on the Clio and the Jag.
As i mentioned the only caveat is i never exceed the factory oci on the filter.
I also try to stick with the same brand oil.
Not sure it makes it any difference, almost certainly doesn't, but i sleep easier.