Off the shelf, no vendor carries such an item as far as I know
Jon Haas of Pantera Electronics might build one. I think the cost would be prohibitive.
there is nothing inherently wrong with the Pantera wiring or the connectors that isn’t to be expected in any 50 year old wiring.
copper wire does not wear out, even after 50 years. The connectors may develop corrosion, especially those outside of the cabin. Attention to detail - especially opening, cleaning and tightly reassembling all ground connections - and elbow grease is usually all that is needed to obtain a safe and functional wiring harness