42×10-51 gives near as damn it same top end as 46×11-36 and slightly lower than the bottom gear. One gap in the cassette I find a bit big occasionally, but no other downside, and frees up LH for a dropper STI.
Wouldn’t want lower gears than either of these offer by bodging a double with a wider than spec cassette as traction is insufficient on gravel tyres on looser surfaces to be beneficial – I already climb in taller ratios than I’d like from time to time to maintain traction.