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If I do /walkers switchShape @p minecraft:chicken, I morph into a chicken. But then, is there any way to reset my shape through commands?

Using /walkers switchShape @p @p doesn't work (neither using the actual username). Don't know if this is a bug.

(I know I can press the keybind, but I think a command would be nice, because it would allow, for instance, using the mod alongside KubeJS in scripts, which is what I tried to do.)

The command is detailed in the wiki.
You have to use /walkers switchShape <player> normal to switch back to a normal player.