This (link) suggests the selective pruning can encourage back budding among other advantages, the chops are legit however slow these may be..really is a very informative read.
http://www.bonsai4me.com/SpeciesGuide/Beechadvancedpruning.htm
@mwar15, may be onto something going bold and low, but I am not frustrated with my caution..yet, can't say I'm not tempted to test this too with a hard 'low' chop on one in the future. So, it is possible to get more than one flush of leaves with any luck. Also, I think
@JudyB possibly may have an idea on this..to chop..or not to chop - above or below highish branches..
For the record, I am not too familiar with Copper Beech, mine are
F. grandiflora ('merica), but these species including
F. slyvatica (euro'; link) don't seem incredibly different. I am curious about what these differences are though, and how this translates in application of techniques..?
So far I see no indication of any new buds on mine, am wondering the cause of some minor leaf-edge browning on one (esp. taller one, too soon on fertilizer??), am happily patient as well. Here's the ones I collected by trenching and getting underneath with camp saw and pruners. They are not as tall in reality as I thought they are, but still..same ballpark. I bare rooted them gently but not excessively (every little dime clumps) with the hose, and put in #8822. The tall one (most leaf-edge browns??) has 1/4 sifted bark. Water once a day usually with the shower hose.



This one I am puzzled what to do with and still very much wanting to thrive, wouldn't exactly call a 'chop' -cut was ~1cm, but its definitely the most vigorous, also had the most buds. It was on a nearly vertical wall under what/is an area of VERY dense shade, that said it is kind of the relative opposite of the other two.
Hope this helps in some degree. Looking forward to how this thing unwinds and your choices. Something about this species is really nice, I grew up around them, they get huge, can spot them in a crowd in winter, habitat indicator, want to keep the bark as flawless as possible to some degree..so far very neat tree.