It's built into their site and they have an SVG icon used in various places, like the footer, where it's referred to as "icn-everton-tower" (i.e., icon: Everton Tower). It was created
two years ago, along with a new font called Rupert Condensed, by a firm called DixonBaxi.
They haven't done anything like the crest, but if they did, it would end up looking something like this, which looks like a big silly face. I don't think they'd incorporate it into the crest.
I'm inclined to think they intend it only for specific contexts, which is really common in design. It's an abstraction of something recognizable, not a replacement for it, so that you can convey the brand more widely, like in iconography, small pieces where the details would be easily lost, etc..
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