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I don't know how wide your Roval freehub is but 11s mtb is the same width as 10s. 11s road is wider. That HG800 has the smallest granny gear of the 11s cassettes that will fit the narrower (not 11s road) body.
I'm using a 6870GS mech on an 11-40, think the max is meant to be 32. Works fine but my frame has the longer mtb-spec gear hanger so i'm fine without a goatlink or b-screw adjustments.
See what mechs are available on eBay.
@PhilDAS and @Emyr
So any shimano 11sp MTB cassette will fit on the Roval 10sp shimano freehub? (do they do a 28T else would need to factor in new rd etc)?
Other option Phil is essentially file this bit away?
Thanks both, really educational and much appreciated
May I ask what you'd do in this situation, if it was required....and you were skint?