Here is a item I ran across this morning (and bought one right away) that looks to be a great way to connect bare wires to any device that has a screw clamp connection. I especially liked the option that show combining two wires into a single connection.
Order link: https://www.amazon.com/gp/product/B073TZ5BBG/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1