Inner tubes may solve the problem. The inner tubes for my Land Rover are rather over 10 inches in diameter when inflated/fully stretched, and when cut, the tube is over four feet long: enough for two, probably, unless you are better endowed than I.
The curvature is no great problem if you cut them right. A simple knot in the end will suffice, sealed with contact adhesive BEFORE knotting (or indeed wearing).
Yes, you lose some sensitivity but it's a small price to pay.