A handy person from Florida says:
I currently have this latch installed, which looks close to your part #82-008K. I would like to upgrade to something more like your part #82-087. I wonder if this is possible. Is there a conversion kit? Could some minor alteration or fabrication make it work?
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Tom from SWISCO responded:

Hello, John. Unfortunately, that won't be possible. Your door was only made to work with this specific type of lockset. No conversion is possible, since after you remove the original there will be a huge hole left in your door. Even if you patch that hole, your door still doesn't have the space for the mortise lock necessary for something like the 82-087 to work.

I am sorry to be the bearer of bad news. As long as you have this door, you are more or less stuck with the style of lock you have now.

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