Windherding does not mean hybrid spells. It doesn't involve creating new spells or spell effects of any kind.
It means an opportunity to take advantage of any synergies in existing effects.
I wonder if the long term best way to develop Windherding, if we can spread the concept is to think a bit like an elf. Think a bit more Cardinally, and work with someone who uses another Wind who also has Windherding and a useful spell creation trait to develop two spells in parallel, one from each Wind, specifically designed to fit around the other spell and produce an effect that the complementary spell synergies with. In an extreme case you could build a spell that does very little on its own but in combination with its partner has a significant effect.
Looking at it like this, existing spells, built to function in isolation, are unsurprisingly not ideal for Windherding.
If this is possible it would be
a lot of work. We'd need to find someone who was an enchanter with the right mindset to learn Windherding and their own spell creation, and then invest the actions to teach them it, and then develop the spells, and then make the enchantments.
Evan elven perspective on time would probably come in handy for that process.
If there are (lesser?) versions of high magic in this setting that the elves know that don't use all eight Winds, just more than one, as Realms of Sorcery says there are, they may be good inspiration.