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I rewrite my sentences to avoid putting non-capitalised proper nouns at the start because my OCPD can't handle this 
Yes, I found myself doing this, too. Presumably "sbt" at the start of a sentence should be "Sbt"?
IPhone is the best. < Like this?
I think that's a bit different because there is a capital letter there, just not the first one, so it's visually a bit less weird, but if still go with IPhone at the start of a sentence.
I'd say so. But it also looks very weird, so I cowardly choose to avoid the problem rather than dealing with it and simply rewrite the sentence 
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