I have the King/Queen bucket seat on my '81 CX500 Custom, and while the wife likes it, the seat puts my knees onto the cylinder heads. It's just not comfortable for me.Also, looking at the goldwing seats for the 82-ish years, I don't think you'd fix your problem because it looks like the driver seat is as short or shorter than the CX500 seat.
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That ^ CX500 custom 1982 seat is on ebay for about $100 shipped. Thought maybe the ruler could give you an idea of it that seat there might be an option.
The GL1100 seat pan does like nearly identical to the CX500, but it's rear bracket is slightly different but looks easily compatible or modifiable.
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If someone gave me the money I have in that bike, I'd send it down the road just that fast.
It doesn't have the legs, or power of my other bikes, so it just sits.