I have to agree with the old skool pollen slinging methods that you mention, they are tedious and even with a skooled breeder the ol skool convention are just as you said and not an absolute guarantee that the organism will be replicated, in fact it wont be with exact with this method.
However with new techniques we can make duplicates quick and easy now . We use seed chipper to find copies of the DNA (if you want to make uniform GG4 seeds). When I help created, (watched) , the 1st ever duplication of a Bison.Bison from bone marrow it was a morbid process. Lots of dead animals. Now we have CRISPR , DNA edits with bacteria,,, I seen this done with enzymes also. And a we can find the Dad before the the organism was self pollinated and we can also just make a duplicate a GG4 also (in man made seeds), in basement or a lab it has become pretty easy now ,. And with pre-made DNA slabs we can even prove to ourselves if we were successfull at duplicating organism in basement with a H.S. chemistry set. Good grower see it in the twisted leaf pattern and other traits and sometime GG4 throws 6 leafs but that a pheno that happens in some gardens, so we can tell and the slabs tell us if its exact...
And now that we found that UASz is about 4 times higher at gene expression factors (hermy DOI gene on/off) than USAp at all stages in the egg producing system. We create GG4 starting at a PURE embryo, somatic cells from GG4 is all we need and in 20 -35 days well have an exact pure GG4,,, or we can create the male Chrome in GG4 repaired also , but some realign male chromes , some say it changes the plant, IDK , but with UASz we can turn the Hermy off in the duplicate seeds.
We can engineer the the GG4 organism to create its own shell and we can encapsulate them in chemials for germination and incubation .
