Yeah, maybe the tape & kevlar is more in the "thinking out loud" category. On the other hand if it doesn't work you can remove it
I don't think there's an elegant solution to this problem. If you're only concerned with rubbing on a dock then the blanket is as good a solution as any. Bring along pool noodle bumpers you can deploy over the side? Maybe something like PVC safety netting if the mesh is small enough?
If you're worried about running into oysters while you're peddling/paddling then you need to modify/protect the hull somehow. That's always going to add weight & drag. There's always a trade-off when trying to make inflatables perform like rotomold boats.
BTW: This may be blasphemy in this forum, but I wouldn't consider an i14 particularly light or portable anyway. Certainly no more than a rotomold boat if you had the vehicle & storage to accomodate it.