I think 36 is the minimum I'd want on a gravel bike but if you use a sub compact double then 34 would probably be alright.
In stuff like 7 Serpents and El Piri I'll definitely still want my 30x42T low gearing. I'd event try and squeeze a 46T on with Wolftooth maybe but I haven't tried that yet. Sounds like sticking with 11S GRX is the way to go.
@hippy started
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I think 36 is the minimum I'd want on a gravel bike but if you use a sub compact double then 34 would probably be alright.