I know of two ways to implement a rearview mirror on an i2. One is to use the accessory bar, which you can attach bike accessories to, and attach a bike mirror. The other is to get one of those mirrors that attaches to a helmet.
I would also say a helmet might be the best way to deal with rain. I would imagine it is possible to ride while holding an umbrella, but this sounds quite awkward and uncomfortable to me.
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