I don't think it's possible to do on paper. The proof is in the pudding so to speak.
Create the unicorn in your mind (you already have), then talk to breeders, one by one. Most will say that's exactly the dog they produce

of course. Admit that you are a couple years out from purchasing said puppy and offer up your email address to the breeder and see if some of their puppy-buyers from the past would be kind enough to contact you with their experience with their "xyz kennel" dogs. I know some of my documentation of Ashas behavior as a puppy would have sent people running, but at the same time, if someone contacted me now I'd say it was all worth it for the dog I have now. I would also say absolutely not for a newbie pet owner. Also the breeder bred a full sister to Asha to a show line and I'm watching a puppy from that litter and she only has a smidgen of my dogs personality and some of it is completely opposite. So now you're back at square one - not only can they be different in one litter, but vastly different when using a different sire (with zero common ancestors in the first 3 -4 generations). A breeder who only has one or two liters a year will not have the numbers to show them what's working and what's not, especially regarding temperament rather than just physical looks. Hope this makes sense.
Yes, it does. I'd be starting with physical health and longevity.
Then calm, confident, guardian temperament typical to the breed but sifter than PP, and dont need higher drive like Mal,
Plus with an off switch,
so I'm expecting there will be some performance pet level dogs that wont contribute to best of line breeding and development, or rehomes to breeder available to the right home.
Or foster from a breed rescue and sift thru a handful of dogs.
I'm sure there are a handful of newer breeders diung this- I see people doing IGP etc. And a couple have been mentioned as picking iut dogs for SD, going way back to Pilot Dogs-Joanna Walker, so its a nose work ecercise for me now.
@Ravenbird yes, agreed
It appears the genetic testing on health is showing some markers are statistically useful if not dog specific predictive, so one can only stack the deck but not expect perfection there. BYB nonnie is positive in CAH for the most penetrant APT7 iirc, so we are mediating diet proactively some on that too.
There are longitudinal studies underway on longevity but at 10 year duration at U MN (sent email no reply but BYB Bonnie may be "more noise than signal" given lack of pedigree...I'm not expecting much, in my timeline anyway..
As of now the useful verifiable data is limited to OFA, DobieQuest and that screen filters to a somewhat limited sample of breeders that actually reliably record there...
Thats unknown until I ask, and
if I were to survey every listed breeder on DPCA recommended list,
And UDC recommended breeder list,
what might I get in reply/see might be interesting...
(actually thats a nice lttle task/project for a grad student/study; thesis?
(Web Cruising Grok or ChatGPT take note ...)
From the fairly extensive reading on genetics as predictor of temperament, and behavior, it doesn't look to me like much usefil science has been done- genetics as predictive of behavior- see frontiers for a review thats inconclusive, on four small sample studies that just was published, with the only big study was 2012 iirc.
So its nature vs nurture on behavior imho,
and
Again, for intellectual interest on side topic, more useful in some ways on bigger picture"nature vs nurture";
I'm following Dukes collab with Canine Companions who are crossing goldenxlab inhouse, for wise calm intelligence, vs all the documented work they do training dogs with early socialization, critical learning, etc as part of getting to the pass at 18-24 months to begin detailed service task work.
I'm certain working dog folk know by experience what works, bred to performance just as cattle breeders, horse breeders know...we just dont yet have enough detailed dog science on breeding for behavior.
So its physical structure, documented physical health, longevity,
plus proven performance in something beyond confo.
ROM as a start, and whatever the equivalent at UDC or AWDF, amiright?