For the X axis, I happened to over-engineer a frame around my HDZ that ended-up covering the lower v-wheels and had wipers too, while not reducing the X travel.
In the end, I focused on good dust collection, which does 95% of the job, and then wipe the rails manually from time to time (which does not yet feel like too much of a chore), and I never had an issue where enough fine dust/debris accumulated in the vwheels that it caused a problem. But then again I don’t do production volumes with my machine, so that may be why this is enough for me.