It's a trike. Clipless is clearly (to me anyway) the "A" answer.
The issue that many people have with clipless pedals is they fear inability to unclip if they have to make a panic stop. That's a non-issue with a trike. You just stop and sit there and it holds itself up.
Mrs. Grouch and I use all SPD-type pedals. Don't skimp on shoes. The stiffer the sole, the better.
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My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.