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You might be able to get away with it in 1x. But cheap options are buy a grx 12 speed long cage derailleur, apparently the pull ratio is close enough to be compatible. Or put a xt m8000 cage on instead
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I have a 812 mech and run 11-46 no problem
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(cheapest) options?
Surely going 2x.
If you have a GRX 800 crankset all you'd need is 46/30 chainrings and a FD (any shimano 11s would work). Assume levers are GRX, so should be already 2x, just need the cable. That way your lower gear would be 30x42, and don't have to change cassette.
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I've only run the 817 RD up to 42T but presume by using a Wolf Tooth Roadlink you could get up to 46T. I actually bought a 46T cassette to try this theory out.
Could you not stick a lower chainring on also?
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with your fitness if you cant get up things with 38x46 I'd just walk for a bit
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Rode Badlands last Sept and got a 34T AliExpress chainring so had 34-42. Would highly recommend going as low as you can around there.
Smallest GRX chainring I could find elsewhere was 36T Wolftooth but over 2x the price and was out of stock at the time. The AliExpress one was absolutely fine.
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@TTM
I'm planning a gravel trip to the Sierra Nevada in May and am starting to think about gearing and could do with some advice.
My current setup is GRX 812, so 1x, running 42t front and 11-42t at the back. I want to go smaller, ideally 38t front and 11-46t at the back. Is that possible or beyond what the RD can handle? If so, what are my (cheapest) options?