My dad's Noble has Harnesses and seatbelt
Yeah, that's my point. It comes with seatbelts for road use and harnesses for track use. It does this because harnesses are dangerous for road use, especially in our cars where visibility isn't exactly great. This is also how I do it, there's room to accommodate both types.
If you can put your seatbelts back in, then you'd be okay to use them on the road and harnesses for the track. Although considering you don't track yours, it'd make the harnesses redundant.
Obviously it's your choice, I was just giving a bit of advise as I've tried what you're doing for a few days before I switched back to using the seatbelts. I even had a remote control so I could operate the stereo because you can't reach the dashboard when you're all strapped in