Does an inexpensive screw terminal "expansion strip" exist?
A Punchdown block would do nicely.



None of those wires seem high gauged, and some look like they were puled out of cat 5 anyway.

Other names for these are 110 Blocks, 66 Blocks, M-Blocks. They are used for telephone, voice (Cat 3) and data (cat 5/6) wiring. Also used in alarm system wiring.