There's is a 150/65R18 and it is designed for either a 4.00 or 4.50 rim so it may be worth a try. It measures 160mm wide and the diameter is 648mm, but sadly there's no 110/70R17 for the stock 3.00 rim
The specs for the front 110/80ZR18 2.50 -3.00 rim 114mm wide, 632mm diameter For the 130/80ZR18 rims 3.00-3.50 129mm wide and diameter is 670mm I don't like pinching radials onto smaller rims because it really screws up the profile and contact patch.
I don't either, but that doesn't mean I won't do it. I have always liked the feedback that Metzelers give when you are approaching the limit.