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I just used a single edged razor blade (the kind you use to scrape off stickers on windows) and carefully cut the plastic clasp without cutting the band. I then used a small zip tie for each band and secured them to the newer bikes.
I might be able to help you. Only SUV, or are you considering/would you consider a larger vehicle? My pass is for an RV, but obviously could be used for smaller.
I can only add dated support for that route, as it’s been seven years since we lived in that area (and we all know that traffic during RAGBRAI can turn any sleepy side route into a quagmire). But L35 is typically pretty quiet, as most traffic uses US 34 or goes up to I-80 to get across the river.