You won’t be able to grow much outside in your zone unless you bury everything deep. Or keep indoors in containers.
If I was you I’d start with a Florea, Green Minchariska and a Chicago Hardy or another better Mt Etna type. Definitely the Florea and GM. De Tres Esplats is another early fig people love.
Sorry if this is repeated I haven’t read everything above.
Is that a early ripening variety for coller climates w/ shorter growing seasons?
Hi Melon, what is “The One?”
It’s early to mid season. It also tends to set good breba figs if well protected, those should be very early.
It’s a tasty fig 
that’s all
Is there a strategy to buying one or two of the varieties listed as the “mother fig tree” and grafting the rest to them as branches? For example, if you don’t want too many honey figs, and improved celeste (example, probably not true) is particularly hardy and precocious, etc.?
Yes but in very cold zones like the OP you’ll need to strategize a means to protect each graft and the wood below from dying back in the cold temperatures. Or you’ll have to graft each year. You can graft very low and cover or bury in winter.