Going in stages, very slowly, I finally cut my strap down to size.
Before I did that I had e-mailed the company for a price quote on a replacement band. I figured that knowing that I could get a new band would make it easier to get going on cutting it down.
It's a good thing that it was the New Year and the reply took a long time to arrive. Yes, I can buy a new silicone band for my $650 (street price, gray market) watch, for $241, plus shipping.
I'm sure that the watch company's attitude is, Oh no, the watch is a $1,900 (list) watch, so $241 is completely reasonable for a purpose-fit silicone strap.
The scary thing is that the watch doesn't really work that well with any other band. To make the silicone strap work optimally, there is a notch between the lugs that mates witha ridge on the silicone strap. It's kind of an eyesore if, for instance, you put a leather strap on the watch. Had I screwed up the cutting I would not have any good option. If I'm going to spend $241 on a strap, it will be one or two custom leather straps, not a silicone strap limited to use on one watch.