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Would opening several secured cards with $1000-10000 limits and not using them be a worthwhile way to reduce utilization and boost score?
If you can afford a 10k deposit for a secured card, you probably shouldn't have a utilization problem to begin with. Maybe just ask your creditors for CLIs instead to help with buffering.
Always better to just airstrike the current balances.
~20% interest on charges >>>>> interest gained on the underlying deposit on the secured card.
Just bad math financially, and if I had to do it over again I would've just done the absolute minimums on my secured cards, picked up 3 and a secured loan and called it a day.