Katabatic flex is likely a good fit for this. Their ratings are comfort/true. Lots of very happy people with these if you do a quick search. Made in Salida, CO.
Pair it with a comfortable insulated pad like Nemo tensor all season and you have a very versatile sleeping system
I was in a similar boat, I had the Kelty Cosmic 20 and paired it with a heavy liner in most temps under 40f. I was researching quilts with the intention of using them throughout Cali and ended up with the KatabicSwatch. For me the big decider was the volume the zippered footbox takes up (2-3 extra litters). I havent taken it out yet but expect to strap it down when its cold and leave it loose when it warms up and it should be fine. I read the katabics are nicer and have a construction where the down bunches less and stay warmer than a EE or Waratah, hope thats true for the premium I paid. I havent found negative reviews for Katabic
As others have said, the Katabatic is the choice. However the Katabatic is comfort rated, so an EE 20 is like a 30 deg Palisade. I am not familiar with PCT temps but you may be able to get away with a Palisade. I sleep warm to 20 on a CCF pad.
but that 40\* nunatak quilt has almost as much loft as most mid-tier 30\* bags. Nunatak, Katabatic, and Gryphon Gear are known for having much more conservative ratings on their bags.
Someone ditching their 30 EE or Zpacks quilt for a 40 degree nunatak quilt is really not losing much sleep insulation. You throw a puffy into that equation and now they are carrying MORE down than they did before.
all of this sidesteps the biggest hole in OPs logic though: The reason people ditch the puffy and just get a more conservative sleep system is it is objectively lighter. If you don't need the puffy jacket except while in your quilt, it is more efficient to just put that down in the quilt.
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NEMO
Disco 15 Series
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Spacious for side sleepers; bulky, temp rating optimistic.
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