Bike computer which doesn't need a smartphone to work
Specific product recomendations are off topic but some general info:

Garmin and Wahoo bike computers at least do not need a phone with the respective apps present when tracking rides. Some features that require phone or Internet connection obviously don't work though.

Wahoo computers allow direct USB connection to a PC and route files can be downloaded manually.

Trying to cut the smartphone out of the loop is a battle you 

https://support.wahoofitness.com/hc/en-us/articles/115000209170-Do-I-need-to-have-my-phone-with-me-while-using-the-ELEMNT-BOLT-

https://support.wahoofitness.com/hc/en-us/articles/115000127910-Connecting-the-ELEMNT-and-BOLT-to-Desktop-or-Laptop-Computers