Welcome, Jeff.
There is no problem setting those small glass tiles over Kerdi membrane. Use a good quality modified thinset mortar as recommended by the tile manufacturer and give it a little extra time to cure before grouting. There is no need for an epoxy mortar and your glass manufacturer may not sanction such use.
Unless one of the Kerdi foam trays fits your shower footprint and drain location near perfectly, I recommend you build a mud floor for your shower instead.
Not sure just what comes in the kits these days, but you actually need only the drain (compatible with your drain pipe material) and membrane to make a shower. I always use the KerdiBand as well, and the pre-made corners are handy, too.
You want to visit the
Schluter website and download the Installation Handbook. You might also find John's Kerdi Shower book quite useful. Schluter also has a number of useful youtube videos available out there.
My opinion; worth price charged.