There is more going on in coffee bean roasting than just the sugar component.
Starting at a higher heat can cause tipping, or uneven roasting.
Ramping to 2nd crack at 7 minutes is too fast for any sort of volume (EG: 250g and above). Will just burn them.
Adding more green beans during the roast just sounds like a waste of 2 lots of beans to me.
You want to get to 2nd at 7 minutes, draw it out to 22 minutes and not bake them? Good luck.
In short, you go ahead and experiment if you want. Im out.