racetech in the USA make the so called "cartridge emulators", thats really the only option for upgrading the fork valving. you'd have to check with them if they have a size that fits your fork
that said, they will have no impact on your static sag, they are more intended to smooth out harshness when hitting bumps.
personally, i am not a fan of progressive springs. Straight rate springs with the right rate for your weight is a much smarter option from my experience.
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