Ed,
I'm not nearly as cosmopolitan as you might think.
I come from Germany and it is not far to Denmark, Belgium, France, Switzerland,....
At prehistoric tournaments (there are events every year in Europe) you can meet many archaeologists and experimental archaeologists and benefit from their experience and knowledge. Some of the tournaments take place at archaeological sites and open-air museums. There were and are also often exhibitions on the subject of bow and arrow et al.
Among other things, I have met there often Jürgen Junkmanns. He has also significantly expressed in the linked thread on paleo planet.
For his book he has researched about 20 years and listed all bow finds in Europe and partially analyzed (he has also found out 2 or 3 years ago during investigations that the bowstring of Ötzi was twisted from sinew and not from plant fibers).
A good knowledge of the history and development of bows and arrows has nothing to do with being good at archery or building good bows and, conversely, you can build good bows or be a good archer without knowing what you actually have in your hand.
As I have already written, I think the name Holmegaard for your shown bows is wrong. You are thus widely spread rumors and misinterpretations sat on so also the Holmegaard principle has nothing to do with the stiff and non-bending ends.
You are of course free to call what you do.
It's just a pity that knowledge and findings are passed on to the future incorrectly.
That is the book of Dr. Jürgen Junkmanns may be others are interested in his knowlegde:
"Pfeil und Bogen: Von der Altsteinzeit bis zum Mittelalter"
Autor/inJürgen Junkmanns
VerlagVerlag Angelika Hörnig,
2013 ISBN3938921277, 9783938921272