I was thinking of buying a Sport hatch to replace my 98 hatch, because mine is from Milwaukee and has rust in the bottom edge(the body seam). But I didn't like the idea of a different hatch with more holes than I already had, with some high up and visible(I'd swap my Mercury trim).
If your hatch is structural sound with no rust, I'd first find a way to remove it, and then see if it's better to keep it. How much did you lubricate the hatch release handle? Mine was sticking about 10-15 years ago, and I bought a new latch kit, before lubricating the old one. It didn't take long to work my old one free, and it has worked like new since. Maybe yours is just stuck really badly, work with it gently and see what you can do. The side latch units are obsolete like most everything, but they also need lubricating. The main handle mechanism on mine was what was sticking sometimes(the handle would not do anything about half of the time).
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