The base of the accelerator pedal is part of the base casting of the entire pedal assembly, so you will retain that half of the accelerator hinge no matter what you do unless you replace the entire pedal structure (clutch, brake and accelerator).
Yes, you have to lift the tunnel carpet from the firewall to just before the shifter on the tunnel, and the carpet in the driver's footwell. It's not a big deal and goes right back without further adhesive (usually).
What, exactly, do you not like with your current accelerator? That might help us to help you.