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do not like sitting in a kayak for hours and then struggling to get out of it
If that's so, sitting on the bottom of pack canoe such as a Placid Rapidfire, which are essentially deckless kayaks, isn't all that much more comfortable, other than the absence of a cockpit. You probably would be more comfortable, especially as you age further, on an elevated canoe seat. Which raises the fundamental issue of whether to get a canoe designed for sitting or one designed for kneeling.
This could indicate that you may not be comfortable in a kneeling canoe. Any very narrow solo canoe, such as the Northstar Trillium, will be primarily a kneeling canoe. I don't know about the Northstar Solo.
You might want to seek out wider solo canoes—e.g., at least 28" at the waterline—or small tandems in which you can sit with comfort and good initial stability. Any canoe made with tractor seats is designed as a sitting canoe.
The Clipper Sea-1 is a rare canoe in the East and I've never seen one in person. You would sit higher than in a kayak or pack canoe but probably lower than in an open canoe. Probably harder to enter and exit than an open canoe.
Deciding on length, width, weight, price level, and sitting design vs. kneeling design are general first steps in the decisional process.