You'll want to homebrew a version of the feat for the specific invocation you want. Someone here or in the homebrew forum can help you if it's a complex one.
Hex is missing from the Fey Touched 1st level divination/enchantment spell list (all three feat versions). Hunter's Mark is there, but Hex interacts with some invocations, so that ought to be there, too.
You'll want to homebrew a version of the feat for the specific invocation you want. Someone here or in the homebrew forum can help you if it's a complex one.
Birgit | Shifter | Sorcerer | Dragonlords
Shayone | Hobgoblin | Sorcerer | Netherdeep
Hex is missing from the Fey Touched 1st level divination/enchantment spell list (all three feat versions). Hunter's Mark is there, but Hex interacts with some invocations, so that ought to be there, too.
Hex is only in the PHB. You will only see that as an option if you have purchased that book (or at least that specific spell) from this website.
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Are they gone? No UA is showing up in Feats, Character Feats for Dungeons & Dragons (D&D) Fifth Edition (5e) - D&D Beyond (dndbeyond.com)
I'm specifically looking for Crusher.
They got published in Tasha's Cauldron of Everything, you need to buy the book to access them