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If you want folks to use more SR items and spells you might consider house ruling that spells with the "(harmless)" tag in their SR entry can pass through SR freely unless the creature with the SR intentionally resists them - kind of like how you can willingly fail the save against a beneficial spell
I've seen this rule used before, and it didn't seem to have any profound effects on the game. Nobody bought SR items anyhow since they cost a lot and are often too weak to be effective against enemy casters. Maybe it would also help adoption to use lots of "mook" casters who plink the PCs with low level nuisance spells.
I mean, I'm not sure why you want folks to buy SR items. I'm just trying to think of ways to make it happen.