I do understand how flying without Headtracking is, because I started with pan view on a hat has well.
My next step might be useful to you, its a paperclip headtracker, you can make one right now with 30 min of time and some duckt tape.
The paperclip is not as good as IR headtracking but its good enough to be superior to pan view, the only requirement is any webcam (I used a "LifeCam HD 3000").
To set it up you only need to get Opentrack (its free - open source) and print out this picure.
Connect webcam to PC start Opentrack tracking with Aruco input and hold the printed out paper infront of it and it starts tracking it. How you attach it to your head is your call, mine looked like this. I used it for around a year until I built myself a HackIR.
Further explanations can be found here: https://github.com/opentrack/opentrack/wiki/Aruco-tracker
Goodspeed and nice flying!
Edit: In terms of the enemys in single player, I´m no expert but I find them to be very predictable and easy to defeat, no matter the difficulty setting. Their aim pretty good on ace setting tho.