I was looking for a convinient source of all of them. I found this list of sources:
http://www.glyconutrientsreference.com/whatareglyconutrients/naturalsourcesofglyconutrients/
There are also glyconutrients mixes available, such as this one:
http://www.custommedicine.com.au/shop/products/Glyconutrient-Food-Supplement-120g.html
It seems acacia gum is an excellent source of arabinogalactan and galactose, perhaps this could be substituted for the larch extract? It certainly is much cheaper.
Sorry for re-stating the obvious, but if you take the combination product you lose the ability, to the extent this is possible, to understand the effects of each. The diversity of nutrients may be fantastic, and it may prove to be more tolerable, obviously I don't know.
We can look at some of the biochemical peculiarities of ME/CFS along with the available microbiomic data and conclude that some are more important than others. I tend to believe that a few are critically important based upon the organisms that preferentially utilize some of these carbohydrates and synthesize other secondary products, which are of critical importance to immunity and cellular maintenance, BUT going "all in" could prove to be most effective. I you choose to do so, please let me know what happens.
If we consider the inherent needs of infants as a guide to what may restore immunocompetency, we may want to look at the core oligosaccharides found in breast milk. While there are hundreds of individual combinations with different isomers and structural configurations of the various oligosaccharides, those carbohydrate building blocks are (I believe) principally comprised of lactose, galactose, fucose, n-acetylglucosamine. Most of the oligosaccharides are NOT degradable by digestive enzymes, and this establishes the essential role for microbial glycosidic catabolism. Perhaps the combination of galactose, fucose, and n-acetylglucosamine is of particular importance. I am also intrigued by n-acetylgalactosamine, and the idea of providing a more "adult-centric" prebiotic that may contribute to supporting the nitrogen metabolism.
As to your question about acacia gum vs. larch extract, I think these will promote different effects because these are structurally distinct despite having the same carbohydrate moieties. The effects in humans are in part attributable to the depolymerization of the arabinogalactan fraction and the preferential microbial ability to do so, not to mention it contains a host of other compounds. This could be better for your biology, I'm simply stating that it is chemically dissimilar and I would anticipate that its effects are not going to be equivalent.
Right now I am looking at five prebiotics, but I'm feeling my way through this like everyone else. Things are going very well though.