Polaroid 803 stand alone negitives

What to do with 803 negatives when the positive chemicals have dried out? Any way to develop the negative without the positive?

I've done it with peel apart, even with ones with paper type negatives such as 667. I am not familiar with the 8x10 film but maybe you could experiment by cutting test strips or into 4, 4x5 parts and test those. For the 667 film I mixed a Beutler developer for around 8mins.