Fairlight Secan low gear options

I've ordered a Fairlight Secan with Shimano GRX 1X. What are my best options to get low gears? I can have a Shimano GRX 40 chain-ring with an 11-42 cassette, which I think is the lowest that GRX will go. However, I fancy going a bit lower but would rather not have a smaller chain-ring.

I know I could go 2X with 46/30 and an 11-34 cassette, but I do fancy trying 1X. 

Any suggestions gratefully received.  

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