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A custom spawner is likely possible, but like any brand new function would need to be scripted- which is the most common limiting factor when it comes to mods, as the experience required is quite steep.
The MinorPets list can definitely be edited with just XML /
S3PE knowledge, the only con is being incompatible with mods that edit the same file. New pets can be added to the list and to the contents of the spawners in this file- they'll also automatically be valid for the RockGemMetal spawner, which checks for type instead of specific species (this is likely to allow minor pets to appear in worlds that predated the expansion).
There's also the pet register from the TS3 Store- I believe the script is patched into the base game, so you may be able to work with that even if you don't have the original object.
When there aren't pre-existing examples or tutorials for working with a type of collectible/spawnable item, resources about custom plants and food are your friend
They cover a lot of the same topics in terms of what is going on in the XML, how to generate IDs that are attached to names, so on that are reused in all similar files.