[1.14] Earliest Time to reference Tags?

I haven't yet worked out the systems necessary to convert my machines recipes over to a JSON system, but as largely speaking they tightly controlled values (eg. 1 raw ore chunk grinds to 2 tiny dust of the same metal type, 8 tiny dust combine to 1 large dust pile) I'm not overly concerned with exposing them via data packs.

I do, however, want to insure mod compatibility and have set up the necessary structures to handle tag-based inputs.

It seems, however, that I can't examine what stacks exist in a given tag until after a world loads, which has led to this:

private static Map<Tuple<Supplier<Tag<Item>>, Integer>, ItemStack> siftTagRecipes = Maps.<Tuple<Supplier<Tag<Item>>, Integer>, ItemStack>newHashMap();

which is storing the parameters passed thusly:

addSiftRecipe(() -> ItemTags.getCollection().getOrCreate(new ResourceLocation("forge","dusts/tiny/iron")), 8, new ItemStack(ModItems.largedust_iron,1));

I can't imagine that this is the best way of doing this. I'll even admit that a Map isn't the best choice either, but it was what was being used by the vanilla recipe manager, but an ArrayList<Tuple<Tuple<Supplier<Tag<Item>>, Integer>, ItemStack>> is equivalent for the purpose and still suffers the same problem:

How best to store a reference to a Tag when the point in time that I create the reference the tag contains no items. As far as I can tell, I need all of those wrappers.

In a related conversation, there does not seem to be any standard for tags that are the equivalent to the old OreDict conventions (e.g. dustTinyThing->dusts/tiny/thing and so forth). I have made a best-guess and can only hope that other developers make the same logical conclusion that I did. I would appreciate if a similar set of guidelines to the old OreDict Common Names were created for the new tag system (as, as far as I can tell, if you specify a different namespace, the tags are unique; e.g. "forge:dusts/tiny/iron" is not the same as "mcmod:dusts/tiny/iron").