Conklin Guitars sell F strings; plain steel .018, wound .020 and wound .022.
Wound .020's usually have thin core wire, and are more prone to breakage. Wound .022-.025s are tight. A plain .018 is much more durable and is better for string bending. A plain steel .016 would be light and perfect for tapping, chording, Ebow, string bending.
If you can find Rotosound plain steel single guitar strings, they are just long enough to reach the bass tuner, just detach a ball end from a dead bass string and thread it onto the guitar string to make the ball fit the bass bridge.