I did a minor re-visit to try out an idea from another author's mod that could be an update to this one (I have permission).
The current glass recipes use 6 matching bottles, so you have a problem if you have 5 or less each of the three varieties. Having an intermediate step of smashing each bottle into cullet (three recipes starting with empty type but each yielding the same material) means that glass can be made from 6 cullet, derived from any combo of bottles.
I added the new recipes without removing the old ones, to make sure it works. Now trying to decide if the old ones can safely be removed in a running game. I have a cullet model that's a re-textured soul gems shards, but it needs more work - probably just removing some effects, and toning down the glow map.
So now I'm looking at all the recipes, in all the mods, to see if any need rework.