WRT the Sewell flat adhesive speaker cable identified by nonoise:
https://www.amazon.com/Ghost-Adhesive-Speaker-Conductor-Sewell/dp/B079MMFVFJ/ref=sr_1_3?dchild=1&keywords=ghost+wire&qid=1618284602&sr=8-3
it would be very easy to glue two layers together using their self adhesive surfaces, and then cut them down the centre to provide two ribbon cables. Simple: If you liked the result you could add an outer protective layer.
Might be worth trying for a cheap taste of the ribbon topology.
https://www.amazon.com/Ghost-Adhesive-Speaker-Conductor-Sewell/dp/B079MMFVFJ/ref=sr_1_3?dchild=1&keywords=ghost+wire&qid=1618284602&sr=8-3
it would be very easy to glue two layers together using their self adhesive surfaces, and then cut them down the centre to provide two ribbon cables. Simple: If you liked the result you could add an outer protective layer.
Might be worth trying for a cheap taste of the ribbon topology.