Adding hyphen - to iskeyword ...but only for keyword completion

I've been doing a lot of work in XQuery, where the convention is for variable and function names to be hyphenated:

   let $this-is-some-variable := this:is-some-function()


...and to complete '$this-is-some-variable',  I'd like to type '$th<C-p>,  but by default that only completes to '$this'

On the other hand, I know I can do :set iskeyword+=- to make it complete all the way, but it has the side effect in that it
makes the basic word motion commands move a lot further than I want them to.

anyone know any way to achieve this?

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