Just found the thread on reweaving Danish cord -- should I be kicking myself?  

You'll find some.
I have gotten a few for under $100 apiece that needed redoing. Just keep your eyes peeled on CL and whatever other local venues you have.
I think mixed sets are ok too, as long as they're the same wood. You can always trade up later on to get a matched set.

Great, thanks for the encoura...
Great, thanks for the encouragement... and you're the one who gave the brilliant re-weaving advice on the other thread, which I look forward to following. I will try to be patient, but I must say my hands are now itching to weave!
I've noticed that some of the chairs of that same model appear different. Some seem to have more rounded backs (I like these ones better). Is this just a difference in the photos, or is it because they are of different times? The wood looks thicker.

There are a bunch of different Møller designs,
and the 75/56 is similar to yours. I have these and I love them---to each her own! The backs are thick, solid wood, very simple and handsome.
Check out all the different models at the link below.
http://www.danish-design.com/manufacturers/mol/

they do show
I have seen a couple of sets. Bought a few. But the market is tougher than it was even a few years ago. Good luck to ya!

Yes, I had the feeling it...
Yes, I had the feeling it was harder to find Danish and mid-century furniture these days, because I actually sold some ugly mid-century stuff I'd picked up over the years that I just no longer like... and I was surprised how much people wanted to pay me for it, seemingly just because it was from the 70's.
Oh well. I'll be patient.
Thanks for the link, Spanky!

Be patient.
If in no hurry they will appear. I'm patient and will find a set eventually. I'm in no hurry at all. I have a set of these. Hans Wegner. The back snapped off one of them last year but was easily repaired. Broke at the dowel. Another snapped last week and split down the back. Not easily repaired. Using some old Emeco's right now in their place. Clearly i need strong chairs.
The thread you found is one of the best here. I'm looking forward to repairing a set also.
Maybe Jesgord can keep an eye out for a set. ; )
(Not this coming week...I only have a quarter tank of fuel left.)
http://www.theswankyabode.com/80572.html

agree you didn't miss out and info on cost/time weaving new
at $500 for 4 -- if the chairs (minus the cord) are in excellent shape -- the price isn't terrible. but also probably as much as you'd need to spend. I bought my set of 8 Moller 71's (all original with hooks in place) for $800 and they were in very good condition and needed to have cord replaced (i posted pics previously -- 6 natural, 2 black). As for cost of re-weaving, i'm in NYC and found that i could have them redone for anywhere from $94 (a place in CT) to $150 per chair. There are a lot of independent weavers out there who price in this range. Schedules and time are a key issue (can take a few weeks to months, depending on their queue and how many chairs you do). The prices include materials, but typically they will charge an additional $15 if they need to install new hooks. Anyone who quotes more than $150 per chair (and i had some say $250-$400!) is over charging relative to the market by a lot, in my opinion. As for doing it yourself, i think it takes about 6-8 hours to do one chair IF you are experienced. It's time consuming and something you want done well. Perhaps fun to try one yourself and see though. As for cost of the cord, should be approx $10 per chair i think (which is always included in the price of re-weaving -- so if you provide the cord, they should deduct their cost of that from their price).