I think it will be hard to break the -PNA. I've noticed the only short term index that is trending over the last few months is negative PNA. If we have a Stronger Nino, there should be a GOA low at least.
El Nino/-QBO is usually perfect for Stratosphere warmings, but we may have done 1 of the cycle already in Feb-March.
I don't think the 7 years in a row of -PNA is done, even if we have a stronger El Nino breaking it temporarily (which will be interesting to see if that happens, so far no signs of change in the N. Hemisphere). (Kind of an interesting clash coming up.)
I also have a satellite-era PDO signal for 4 Winters of +PNA starting 23-24, so maybe the opposite of what you're thinking. That's just a map of NAO's that don't correlate, the next Winter, it becomes a pressure-dominant NAO index.