I put a call into them to see if they can help me. This search is becoming exhausting.There are other Kalkhoff dealers in the US. Here is one in So Cal, and I'm sure there are others: (Link Removed - No Longer Exists).
Ebikes are niche market, overpriced relatively to production costs, and expensive ebikes are a smaller market yet. Call Kalkhoff.
Agreed on recommendations to avoid rear-rack battery (if possible). On the Kalkhoff homepage in the section "US/AUS Models" the Impulse 8HS isn't listed. They must have renamed it. There are similar models with battery behind the seat post: (Link Removed - No Longer Exists)
I don't see anything in their line-up with really upright position, with wide swept-back cruiser handlebars. Though probably more upright than what you're riding now.
120 miles range? Maybe. Keep in mind that it's mere 250W motor.