I use SPDs with clip in on one side and flat on the other. I have both of these:
FUNN
https://rideissi.com/pedals/issi-flip
The Funn Mambas are better on the flat side and the Issi Flip are better on the clip side. I like them both. Once you clip in, you probably won't go back to flats on your gravel bike!
Take car,
Mike
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