backhugger can be tilten on joint ball in all 8 directions having all the Left and Right Bumper, Trigger combinations that you'll ever need! :) 

Middlefinger being the most suited for operating this ONE-HAND, finger slides into the pocket on the neck of backhugger, from there you can pull it, push it to the left, right and back and everything in between to archive various LB, RB, LT, RT combos.

Printed pieces: 4 (wrap, joint ball, backhugger and sqeeze) 

Print orientation in pictures looking on print bed it slicer.

Self threading screws: 3x Diameter 3mm with lenght 20mm

or

2x M3 screws lenght 20mm and one self threading screw for the joint ball.

Assembled creation in pictures. 

Easily servisable swappable joint ball. That can be scaled to fit perfectly. Model is made so that it'll rather need some sanding which can ensure perfect amount of friction.

Sqeeze can also adjust the friction by tightening the 2 screws without dissasembling it.  

Left hand: Pinky - L joystick, Ring - D pad, Middle - ONE-HAND, Thumb - R joystick, Index - XYAB

Right hand: Index - L joystick, Thumb - D pad, Middle - ONE-HAND, Ring - R joystick, Pinky - XYAB

Controller should be on soft cloth surface or secured with plasticine, rumble turned off for these setups.

Let me know what you think or changes I can make for your finger controller setup.

Alternatively you can play on two XBOX One controllers at the same time with just 2 hands.

NR, CZ