How To Plug LEDs In A Rubber Extrusion?

Hello, everyone! I need to plug a lot of LEDs in a rubber extrusion 20 meters long and make them light in a determined direction.

So I have a number of questions about the best way of doing it for a small series of such objects. I'll be very grateful for your answers.

1. Should I make a garland first using heat shrink and then glue it to holes in the extrusion or integrate a wiring together with a connectors like BLS first and then use a special diod holders or may be there is a better way?

2. What is the best material for such extrusion? It must be strong enough to hold diodes safe under the human weigth, but allow to roll it up to a ring with diameter of approximately 5 meters without plastic deformations. Extrusion will have approximately 20x20 millimeters section size.

3. Can you give me any recommendations on the glue's type for glueing ribbon cable and a material of extrusion from question 2.