The R22 will do what you're asking.
I've flown it sideways over freeways for photowork. I would guess I had it up to at least 20 knots. It's difficult and you have fight the helicopter somewhat but it will perform. I never had any indication or thought of a problem with mast bumping while sideways. Be careful though, with a pedal pushed to the floor and the cyclic in an odd position, things can go south quick.
I don't see where the 17 knot figure comes into this. 17 knots is the maximum demonstrated controllability in a hover at high density altitude, not a sideways flight limit recommendation. Though I think the manufacturer can certify this not by waiting for 17 knot winds at high density altitude, but by flying sideways at 17 knots.
There is no 'real' difference flying sideways at 20 knots compared with a hover in a 20 knot crosswind.