You're out of luck, the processor costs something like $10, taking it it out would hardly nudge the price. Get a cheap android tablet or a mini LED projector instead.
The processor alone would barely nudge the price, but removing the NAND, RAM, and camera modules along with it definitely would make huge difference. Even more if you can kill the touchscreen.
Unfortunately, the resulting product is also an incredibly limited niche.
Unfortunately, the resulting product is also an incredibly limited niche.