The Beeline Velo 2 unit may be of interest to the OP. I don't think it supports peripheral sensors like for cadence, but it is very simple and offers a large, clear, speedo readout.
Velo2 requires pairing to a mobile phone for GPS speed and, if you're interested, live navigation.
https://beeline.co/products/beeline-...DfkTlMsjUnH6uF