So, sure, yes, by all means do things like pass residential-in-repurposed commercial changes, ADUs, greater density in transit-oriented neighborhoods - do all the things. But, getting more people able to move to parts of the state (in my case, Yakima, the Tri-Cities, Spokane, etc) where there are houses just sitting around relative to King / Pierce / Snohomish... that's just as viable a solution and solves a whole bunch of other water / energy / land use / political / social type problems.
Over three quarters of all residential land in Seattle is zoned single family and the population density of the city is less than a third that of NYC. The geography is not the hard constraint in this city.
Sounds like you've found an infinite-value hack: let developers build infinite housing yet prices stay the same.
How many of those "random policy ideas into the void" were to lift regulations to allow people to build housing? Which sounds a hell of a lot simpler than figuring out how to make everyone wealthier without proportional increases in market prices.