Check out this thread: Hammerhead Karoo 2
Also: https://www.strava.com/athletes/1169359/posts/11354722
Xert Mobile already records your GPS track (enable under Options).
BLE sensors connect fine with an Android phone. No need for ANT+.
Unless TBT and preloaded courses are important to you there’s no need for a routing app although you could load one and switch to it as needed.
95% of my outdoor rides are on routes I already know. Google Maps has handled my detours. 